msqe2009 stats

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msqe2009 stats

priyanka p
in how many ways can three persons, each throwing a single die once , make a score of 8?  options are (A) 5  (B) 15  (C)  21  (D) 30                       my answer is option c that is 15 ways,  explanation goes like this, ( 1,6,1) in 3 ways (1,5,2) in 3 ways , (1,4,3) in 3 ways , (2,2,4) in 3 ways and (3,3,2) in 3 ways.   so answer cums to be 15 ways in total. is it correct??
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Re: msqe2009 stats

Amit Goyal
Administrator
(1,1,6) 3 possibilities
(1,2,5) 6 possibilities
(1,3,4) 6 possibilities
(2,2,4) 3 possibilities
(2,3,3) 3 possibilities
Total = 21 possibilities