Mathematics, 15.12.2021 02:50, hermesrobles
If C(n, r) denotes the number of combination of 'n' things taken 'r' at a time then the expression C(n, r+1) + C(n, r-1) +C(2n, r)=?
Answers: 2
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If C(n, r) denotes the number of combination of 'n' things taken 'r' at a time then the expression C...
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