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(n - 1)Cr + ^(n - 1)Cr - 1 is ..... (a) ^(n + 1)Cr (b) ^(n - 1)Cr (c) ^nCr

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(n - 1)Cr + (n - 1)Cr - 1 is .....

(a) (n + 1)Cr 

(b) (n - 1)Cr

(c) nCr

(d) nCr - 1

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Answer is (c) nCr 

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