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Standard Limits to Remove Indeterminate Form

21. If nC(r-1...

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21. If nC(r-1) = 36 and nCr = 84 and nC(r+1) = 126 then value of r is : (A)9 (B)3 (C)4 (D)5 (E)6

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^{n} C_{r - 1} = 36,^{n} C_{r} = 84

^{n} C_{r + 1} = 126

then the value of

^{n} C_{8}

Q. If ⁿC_r_{– 1} = 36, ⁿC_r = 84 and ⁿC_r_{+ 1} = 126, then r = ____________.

^{n} C_{r - 1} = 36,^{n} C_{r} = 84

^{n} C_{r + 1} = 126

, find the values of n and r.

^{n} C_{r - 1} = 36,^{n} C_{r} = 84

^{n} C_{r + 1} = 126,

r

.

^{n} C_{r - 1} = 36,^{n} C_{r} = 84,^{n} C_{r + 1} = 126

(n, r)

=

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