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If P = 21(21^2-1^2)(21^2-2^2)(21^2-3^2)....

If `P = 21(21^2-1^2)(21^2-2^2)(21^2-3^2)...............(21^2-10^2),t h e nP` is divisible by a. `22 !` b. `21 !` c. `19 !` d. `20!`

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Factorize: 21x^(2)-2x+(1)/(21)

25. The value of (21_C_1- 10_C_1) +(21_C_2- 10_C_2)+ (21_C_3- 10_C_3) +...............+(21_C_10- 10_C_10)