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Q.

1+C1C01+C2C11+C3C21+CnCn-1 is equal to 
 

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a

n-1nn!

b

n+1nn!

c

n+1nn-1!

d

n+1n!

answer is A.

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Detailed Solution

  1+C1C0 1+C2C1 1+C3C2 ......... 1+CnCn-1 =1+n-1+11 1+n-2+12 1+n-3+13......1+n-n+1n =(n+1)1 (n+1)2 (n+1)3 ..... n+1n =(n+1)nn !

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1+C1C01+C2C11+C3C2……1+CnCn-1 is equal to