Nightmist

14 Questions
0 Answers

-1

730

2

+41

help

We say that a quadrilateral is a bow-tie if two of the sides cross each other. Seven different points are chosen on a circle. We draw all C(7,2) chords that connect two of these points. Four of these 21 chords are selected at random. read more ..

Nightmist Feb 2, 2020

-1

612

0

+41

help

Find the number of ways of arranging the numbers 1,2,3...12 in a 3x4 array (with three rows and four columns), so that the sum of the numbers in each column is divisible by 3. Each number must appear exactly once in the array.
(show working read more ..

Nightmist Feb 2, 2020

-1

677

1

+41

help

I have a bag that contains 6 nickels and 5 pennies. I draw coins from the bag at random, without replacement. Find the probability that after drawing 4 coins, I have removed at most 2 pennies from the bag.

Nightmist Feb 2, 2020

-1

680

1

+41

help

The Bad News Bears are playing against the Houston Toros in a baseball tournament. The first team to win three games wins the tournament. The Bears have a probability of 2/3 of winning each game. Find the probability that the Bears win the tournament. read more ..

Nightmist Feb 2, 2020