n C r - n C r -1 is equal toA- n-1 CrB- n Cr-1C- n-1 Cr-1D- n-1 Cr-1

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Sum of Coefficients of All Terms

n C r + n C r...

Question

$^{n} C_{r} +^{n} C_{r - 1}$ is equal to

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Solution

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Similar questions

^{n} C_{r} + 2^{n} C_{r - 1} +^{n} C_{r - 2}

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

$^{n} C_{r} + 2^{n} C_{r - 1} +^{n} C r - 2$ =

(2 \leq r \leq n),

^{n} C_{r} + 2 \cdot^{n} C_{r + 1} +^{n} C_{r + 2}

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

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