Question

A bag contains 6 white, 4 black and 2 blue balls. Find the chance of either a getting black or blue ball in a single draw.

Answer 1

Answer:

665Q:

A bag contains 6 white and 4 black balls .2 balls are drawn at random. Find the probability that they are of same colour.

A) 1/2

B) 7/15

C) 8/15

D) 1/9

Answer: B) 7/15

Explanation:

Let S be the sample space

Then n(S) = no of ways of drawing 2 balls out of (6+4) =10C2 10 =10*92*1 =45

Let E = event of getting both balls of same colour

Then,n(E) = no of ways (2 balls out of six) or (2 balls out of 4)

=6C2+4C2 = 6*52*1+4*32*1= 15+6 = 21

Therefore, P(E) = n(E)/n(S) = 21/45 = 7/15

Answer 2

Answer:

6/12 .

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