Question

A box contains 3 white, 4 red and 7 blue erasers. If five erasers are taken at random then the probability that all the five are blue color is:

a) 13/211 b) 2/126 c) 3/286 d) 12/121​

Answer 1

Answer:

Total number of erasers in the box = 3 + 4 + 7 = 14

Let S be the sample space

Then, n(S) = number of ways of taking 5 out of 14

Therefore,

n(S)=14C5=14×13×12×11×102×3×4×5=14×13×12=2002n(S)=14C5=14×13×12×11×102×3×4×5=14×13×12=2002

Let E be the event of getting all the 5 blue erasers

Therefore,

n(E)=7C5=7×6×5×4×32×3×4×5

Step-by-step explanation:

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