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If ^15 C(3r):^(15)C(r+1)=11 :3 , find th...

If `^15 C_(3r):^(15)C_(r+1)=11 :3` , find the value of `rdot`

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
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  3. If ^15 C(3r):^(15)C(r+1)=11 :3 , find the value of rdot

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  4. If the ratio ^2n C3:^n C3 is equal to 11:1 find ndot

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  14. If ^(56)P(r+6):^(54)P(r+3)=30800 :1, find r.

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