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Find n, if " ^nC4, "^nC5 and "^nC6 are i...

Find n, if` " ^nC_4`,` "^nC_5 `and `"^nC_6` are in A.P

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Find n if "^nC_2 = ^nC_3 .

If "^nC_8= ^nC_2 , find "^nC_2 .

If "^nC_8 = "^nC_2 , find "^nC_2 .

If ""^nC_r= ""^nC_s , then n is:

If ""^nC_8= ""^nC_9 , then n is:

If nC_6=nC_2 , find ^nC_2 .

Determine n if "^(2n)C_3 : "^nC_3 =12:1

Determine n if "^(2n)C_3 : "^nC_3 = 11 : 1

Prove that "^nC_r ^rC_5= ^nC_5 ^(n-5)C_(r-5) .

If ^nC_(r-1)=36 , ^nC_r=84 and ^nC_(r+1)=126 , then find ^rC_2 .