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Post New Question
All Questions
+0
230827 Questions
0
360
2
help
Find the number of ways to put 5 indistinguishable balls in 4 distinguishable boxes.
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Guest
Dec 4, 2019
0
372
0
help
The sum of the series a + ar + ar^2 + ... is s, and the sum of the series a + as + as^2 + ... is r. Both r and s are positive, and r and s are not equal. What is r + s?
Guest
Dec 4, 2019
0
658
2
help
If x + 1/x = (1 + sqrt(5))/2, then find x^2000 + 1/x^2000.
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Guest
Dec 4, 2019
0
560
1
+19
specific
Q: A,B,C,D,E, and F are 6 students. In how many ways they can seat in a row if: A) There is no restriction
B) A must seat at the beginning and F must seat at the end of a row,
C) A and B must seat beside each other.
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tdsantiago1
Dec 4, 2019
0
1004
4
+1712
I've just noticed something
It can't believe it took me this long to figure out.
I just noticed that so many people stop doing anything on Web20Calc even when they try after the summer break.
read more ..
off-topic
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tommarvoloriddle
Dec 4, 2019
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777
2
help
If x, y, z are positive real numbers such that xyz = 8, find the minimum value of x + y + z.
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Guest
Dec 4, 2019
0
589
1
help
Find the minimum value of a/b + b/a, where a and b are positive real numbers.
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Guest
Dec 4, 2019
0
678
1
Help with AM-GM?
Find the maximum value of
over all real numbers and .
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Guest
Dec 4, 2019
0
613
1
help
At Ann's 7-years olds party all 20 invited guests are going to get some candy from the fish pond. In 12 of the bags there is an extra chocolate bar. Tina and James are first and second out, what is the probability that they both get a bag with an extra
read more ..
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Guest
Dec 4, 2019
0
544
1
Which graph represents the function?
Please help ASAP! Only correct answers please thank you
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Guest
Dec 4, 2019
-1
562
0
+318
Given two dependent random samples with the following results:
Given two dependent random samples with the following results:
Population 1: 56 66 69 66 60 59 56 54
Population 2: 65 64 74 64 63 64 54
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mharrigan920
Dec 4, 2019
0
352
0
help
n elements are distributed among three sets A, B, C such that some elements of A are in B, some elements of B are in C, but no elements of A are in C. What is the minimum value of n?
Guest
Dec 4, 2019
0
547
2
help
Find the sum of the first 14 terms of 2, 5, 8, 11, ...
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Guest
Dec 4, 2019
0
356
0
help
How many sets are there where {1,2} is a subset of A, and A is a subset of {1,2,3,4,5}?
Guest
Dec 4, 2019
0
516
3
help
You flip a fair coin. What is the probability that you get 2 heads and 3 tails?
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Guest
Dec 4, 2019
0
378
1
help
Find the number of ways to put 3 distinguishable balls in 7 indistinsuishable boxes.
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Guest
Dec 4, 2019
0
382
1
help
Find the smallest positive integer n such that n! ends in 2016 trailing zeros.
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Guest
Dec 4, 2019
0
442
1
help
Find the least positive integer n, such that 2 divides n, 3 divides n+1, 4 divides n+2, 5 divides n+3, and 6 divides n+4.
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Guest
Dec 4, 2019
0
641
1
help
John drew a triangle such that all the angles, in degrees, were perfect squares. What was the largest angle among them, in degrees?
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Guest
Dec 4, 2019
0
358
1
help
How many positive integers have no repeated digits?
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Guest
Dec 4, 2019
0
650
0
+19
(Á∩B)U(A∩B)
(Á∩B)U(A∩B)
A=23,29,31,37, 41, 43.
B=43,41,47
U= 53,59,61,67,71
read more ..
tdsantiago1
Dec 4, 2019
0
373
1
help
Magic Mike multiplies two numbers to get 1000. Neither of Magic Mike's numbers contains a 0. What are Magic Mike's numbers?
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Guest
Dec 4, 2019
0
719
2
help
△ABC is a right triangle and line segment AD is an altitude.
If AB = 10 and BD = 8 then what is the area of \△ABC?
read more ..
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Guest
Dec 4, 2019
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