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6 years, 9 months ago
number of non-negative integral solutions of
a+b+c+d<=15 ?
6 years, 7 months ago
let me start with a example,
If you have |||| (4 identical bars) and you have to divide between 3 people how would you do?
The places are ||-|-| So, two things are helping to separate identical things between 3 people, how many combinations possible here?
It is just like the arrangement of 4 bars and 2 dashes (6C2) or simply 4+3-1C3-1
So like this it is here,
15+4-1C4-1 = 18C3
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