Mark the correct alternative in the following: The probability of selecting a male or a female is same. If the probability that in an office of n persons (n – 1) males being selected is , the value of n is

Question

Philoid · Accepted Answer

Given:

P(females)=p(males)=1/2

p(x=n-1) =

n=?

p(x=n-1) = ⁿC_n-1 p^n-1 q¹

Since p=q

p(x=n-1)= n p^n-1q

=n p^n-1p

=npⁿ

=n

comparing LHS anr RHS

we have,

n=12

Mark the correct alternative in the following:The probability of selecting a male or a female is same. If the probability that in an office of n persons (n – 1) males being selected is , the value of n is

Mark the correct alternative in the following:
The probability of selecting a male or a female is same. If the probability that in an office of n persons (n – 1) males being selected is , the value of n is