Math, asked by satya2262, 1 year ago

A box contains 6 white balls and 7 black balls. Two balls are drawn at random. What is the probability that both are of the same color?

Answers

Answered by ankitasharma

There are two ways of of getting both same colour,i.e both white or both black.

So when we get both black, probabilty is (7/13)*(6/12)=42/156.

When we get both white, probavility is (6/13)*(5/12)=30/156.

So total probability of getting both same colour is (42/156)+(30/156)=6/13

satya2262: in the previous problem it was 7/13 but why u hv multiplied 6/12.. cn u plzz answer me

ankitasharma: cox when we took out one ball, we need to minus it.

satya2262: in both numerator n denominator we hv to minus 1

ankitasharma: hence no of black balls will reduce from 7 to 6 while the total no will decrease from 13 to 12

satya2262: oo thnq

ankitasharma: yeah sure. and pls mark this brainliest

ankitasharma: thx for marking

satya2262: wc.. but if 5 green and 4 red balls than

satya2262: two balls are picked random

satya2262: the probability that they are of the same color

Answered by Anonymous

$\sf \pmb{Answer :}$

There are two ways of of getting both same colour,i.e both white or both black.

So when we get both black, probabilty is (7/13)*(6/12)=42/156.

When we get both white, probavility is (6/13)*(5/12)=30/156.

So total probability of getting both same colour is (42/156)+(30/156)=6/13

Previous Question

Next Question