A couple has one or two or three children with probability 
, 
and 
respectively. Probability of a couple having exactly four grandchildren in such a type of society is 
then sum of digit of q equals. (Where p & q are co-prime natural numbers)
Text Solution
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Sol. A : Exactly one children ; B : Exactly two children ; C : Exactly three children
P(a) = 
P(b) = 
P(c) = 
; E : Couple has exactly 4 grand children
P(E) = P(a).P 
+ P(b).P 
+ P(c).P 
P(E) = 
.0 + 
+ 
= 
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