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If ^n Pr=720a n d^n Cr=120 ,t h e nr to...

If `^n P_r=720a n d^n C_r=120 ,t h e nr` to a. `3` b. `4` c. `5` d. `6`

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If ""^(n)P_r=720 ""^(n)C_(r) then r is equal to

If .^(n)P_(r)=720 and .^(n)C_(r)=120 then find the value of r.

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If a : b=5:7 a n d c : d=2a :3b , t h e n a c : b d is 10 : 21 b. 20 : 38 c. 50 : 147 d. 50 : 151

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