Bunuel wrote:

There are a number of red beads and white beads in a jar. If Mike were to simultaneously pick two beads from the jar, what is the probability that he will not pick any red beads?

(1) The probability of selecting two red beads is 8/45.

(2) The probability of selecting two white beads is 1/45.

Hi,

before we solve lets see what are the types of prob when two items are involved

1) both red

2) both white

3) one white one red

what does "probability that he will not pick any red beads" MEANS..

ONLY the second case " both white"lets see the statements

(1) The probability of selecting two red beads is 8/45.we know prob of 1, and of rest two combined but NOT both white

Insuff

(2) The probability of selecting two white beads is 1/45.This is the second case we are looking for

Suff

B

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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372

2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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