need the solution

 Posts: 17
 Joined: Mon May 09, 2016 11:18 am
need the solution
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?
 Abdullah Al Tanzim
 Posts: 9
 Joined: Tue Apr 11, 2017 12:03 am
 Location: Dhaka, Bangladesh.
Re: need the solution
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} $...
$ 1+2+3+.............+101$ and the sum of the series is $ \frac {102.101}{2} $...
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