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509

+13

Indistinguishable balls into distinguishable boxes

How many ways are there to put 2 indistinguishable balls into n distinguishable boxes?

My attempt:
I solved this problem similar way as stars and bars problem. I treated boxes as bars and balls as stars. So read more ..

yaseenmollik Jul 12, 2020

511

help please

Quadrilateral ghjk is a rectangle. find measure <2 and <7 if m<3 = 37.

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Guest Jul 12, 2020

470

Please help!

https://web2.0calc.com/questions/please-help_90350#r2

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Guest Jul 12, 2020

442

+13

Distinguishable balls into indistinguishable boxes

How many ways are there to put 2 balls(distinguishable) into n boxes(indistinguishable)?

yaseenmollik Jul 12, 2020

547

i need the answer

The length of the Nile River in Africa is approximately 6,695,000 m long. When this number is written in scientific notation in the form a x 10n, the value of n is: {

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Guest Jul 12, 2020

412

please help with this!

Find angles x and y

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Guest Jul 12, 2020

503

help with sum

Compute

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Guest Jul 12, 2020

343

hard geometry

In equilateral triangle ABC, vertices A, B, and C lie on three different lines. The distance between the lines for A and B is 1, and the distance between the lines for B and C is 2. Find the side length of the equilateral triangle.
read more ..

Guest Jul 12, 2020

481

expressions

Please help with this problem.

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Guest Jul 12, 2020

543

please help!

Consider the system of quadratic equations y =3x^2 - 5x, y = 2x^2 - x - c, where c is a real number.

(a) For what value(s) of c will the system have exactly one solution (x,y)?
read more ..

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Guest Jul 12, 2020

516

precalc problem

Compute

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Guest Jul 12, 2020

501

from my problem set

Integers, like molecules, are built from atoms. However there's only one element in the periodic table of maths, namely the number 1, and all other integers can be built from it. For example, there are several ways to build the number 6:
read more ..

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Guest Jul 12, 2020

381

need help on trig problem

If , find

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Guest Jul 12, 2020

508

Hmm

So derivative has the definition of (f(x+h)-f(x))/h. What would be the definition of integral?

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Guest Jul 12, 2020

1380

+315

help please

In how many ways can a president and a 2-person committee be chosen from a group of 8 people (where the order in which we choose the 2 people doesn't matter)? (The president cannot be on the committee.)

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polyyou Jul 12, 2020

455

can you help?

Find the equation of the line

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Guest Jul 12, 2020

1040

+315

helps please

Eugene, Brianna, and Katie are going on a run. Eugene runs at a rate of 4 miles per hour. If Brianna runs 2/3 as fast as Eugene, and Katie runs 7/5 as fast as Brianna, how fast does Katie run?

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polyyou Jul 12, 2020

486

geometry

Determine the measure of ∠A.

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Guest Jul 12, 2020

456

please help with geometry

Find CD.

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Guest Jul 12, 2020

588

+315

help please

Pick two or fewer different digits from the set {1, 3, 6, 7} and arrange them to form a number. How many prime numbers can we create in this manner?

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polyyou Jul 12, 2020

583

+315

hi jimkey17

hi jimkey17! Congragalations! You went on the leaderboard!

off-topic

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polyyou Jul 12, 2020

580

+315

help please

what is

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polyyou Jul 12, 2020

669

+81

PLS HELP ASAP

Let $S$ be the set of all positive integers that have four digits in base $2$. What is the sum of all of the elements in $S$, when expressed in base $2$ ?

off-topic

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toodlestraws Jul 12, 2020

1757

i need help please advanced algebra question :(

Determine the unique pair of real numbers satisfying

Enter your answer as an ordered pair in the format , where and are replaced by appropriate numbers. read more ..

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Guest Jul 12, 2020

All Questions ⁺⁰234927 Questions

Indistinguishable balls into distinguishable boxes

help please

Please help!

Distinguishable balls into indistinguishable boxes

i need the answer

please help with this!

help with sum

hard geometry

expressions

please help!

precalc problem

from my problem set

need help on trig problem

Hmm

help please

can you help?

helps please

geometry

please help with geometry

help please

hi jimkey17

help please

PLS HELP ASAP

i need help please advanced algebra question :(

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