need the solution

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need the solution

Post Number:#1  Unread postby kh ibrahim » Sat Jul 08, 2017 7:31 pm

x takes part in three subjects physics, chemistry and mathematics.Each of the subjects is of 100 marks.How many ways can he obtain 200 out of 300?
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Re: need the solution

Post Number:#2  Unread postby Abdullah Al Tanzim » Sun Jul 30, 2017 11:35 am

I think it is $ \frac {102.101}{ 2} $. Notice if you get o in physics then you will have only one way to get 200 marks in the three subjects.if you get 1 in physics then you will have 2 ways and for 2 you will have 3 ways and it will go on for o to 100 ..It forms a series that
$ 1+2+3+.............+101$ and the sum of the series is $ \frac {102.101}{2} $... :)
Everybody is a genius.... But if you judge a fish by its ability to climb a tree, it will spend its whole life believing that it is stupid - Albert Einstein
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