If \ ^(15)C(3r)=\ ^(15)C(r+3), find \ r...

If `\ ^(15)C_(3r)=\ ^(15)C_(r+3)`, find `\ rdot`

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The correct Answer is:

3

`.^(15)C_(3r)= .^(15)C_(r+3)`
`implies 3r=r+3 " or" 3r+r+3=15`
`implies r=3` (as r is positive integer)

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