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Q.

If r=130r2 30Cr2 30Cr1=α×229, then α is equal to ______.

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answer is 465.

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Detailed Solution

r=130r2 30Cr2 30Cr1=r=130r231rr30!r!(30r)! 30Cr 30Cr1=30r+1r=31rr=r=130(31r)30!(r1)!(30r)!=30r=130(31r)29!(r1)!(30r)!
=30r=130(30r+1)29C30r=30r=130(31r)29C30r+r=13029C30r=3029×228+229=30(29+2)228=15×31×229=465229α=465

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If ∑r=130 r2 30Cr2 30Cr−1=α×229, then α is equal to ______.