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nCr Definitions and Properties

If n P r =336...

Question

If $^{n} P_{r} = 336,^{n} C_{r} = 56$ , then find n and r and hence find $^{n - 1} C_{r - 1}$

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Solution

n = 8, r = 3 and 21

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Similar questions

If ⁿP_r = 336 and ⁿC_r = 56 find n and r.

^{n} P_{r} =^{n} P_{r + 1}

^{n} C_{r} =^{n} C_{r - 1}

, find n and r.

^{n} P_{r} = 5040

^{n} C_{r} = 210

n

r

^{n} P_{r} =^{n} P_{r}_{+}_{1}

^{n} C_{r} =^{n} C_{r}_{-}_{1}

, then the values of n and r are:

^{n} P_{r} =^{n} P_{r + 1}

^{n} C_{r} =^{n} C_{r - 1}

, then the values of

n

r

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