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Mauryan Art- Stupa

75.summition ...

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75.summition nCr/(nCr+nCr+1) equals

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\sum_{r = 0}^{n - 1} \frac{n_{C_{r}}}{n_{C_{r}} + n_{C r + 1}}

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

^{n} C_{r - 1} = 10,^{n} C_{r} = 45

^{n} C_{r + 1} = 120

r

^{n} C_{r - 1} = 10,^{n} C_{r} = 45

^{n} C_{r + 1} = 120

r

^{n} C_{r - 1} = 56

^{n} C_{r} = 28

^{n} C_{r + 1} = 8

then r is equal to

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