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If nP5=20nP3 find the value of n...

If nP5=20nP3 find the value of `n`

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
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  3. If nP5=20nP3 find the value of n

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

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