Question ID - 67924 | SaraNextGen Top Answer
A shopping mall is running a scheme: ‘Each packet of detergent “SURE” contains a coupon which bears letter of the word, “SURF”, if a person buys at least four packets of detergent “SURF”, and produce all the letters of the word “SURF”, then he gets one free packet of detergent
If a person buys 8 such packets at a time, then number of different combinations of coupon he has
a)
b)
c)
d)
A shopping mall is running a scheme: ‘Each packet of detergent “SURE” contains a coupon which bears letter of the word, “SURF”, if a person buys at least four packets of detergent “SURF”, and produce all the letters of the word “SURF”, then he gets one free packet of detergent
If a person buys 8 such packets at a time, then number of different combinations of coupon he has
a)
b)
c)
d)
(c)
Let in 8 coupons S, U, R, F appears 
times. Then 
, where 
We have to find non-negative integral solutions of the equation. The total number of such solutions is 
If a person gets at least one free packet, then he must get each coupon at least once, which is equal to number of positive integral solutions of the equation. The number of such solutions is 
. Then, the probability that he gets exactly one free packet is
The probability that he gets two free packets is 
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