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1]
each child has to recieve one apple
remaining apples=5
now 5 apples have to be distributed among 6 children where each may recieve 0-6 apples.
c+r-1Cr-1=5+6-1C5-1
=>10C5
=252
2]
to find integral positive sol of x+y+z+w=20
give 1 to x,y,z,w
thus we have to find no of non negative sol of x+y+z+w=16
=>n+r-1Cr-1=16+4-1C4-1
=19C3
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Moderation Team
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