If `2. nP_1, nP_2, nP_3,` are three consecutive terms of an A.P. then they are-

If S_1 , S_2 ,....... S_p are the sum of n terms of an A.P.,whose first terms are 1,2,3,...... and common differences are 1,3,5,7.....Show that S_1 + S_2 +.......+ S_p = [np]/2[np+1]

If S_(n) =nP +1/2 n (n-1) Q, where S_(n) is the sum of first n terms of an A.P. then the common difference of the A.P. will be-

^nP_5=20. ^nP_3 , then n is equal to:

If S_(1),S_(2),......S_(p) are the sum of n terms of an A.P.whose first terms are 1,2,3,...... and common differences are 1,3,5,7..... Show that S_(1)+S_(2)+......+S_(p)=(np)/(2)[np+1]

If S_(n) = nP + (n (n - 1))/(2) Q where S_n denotes the sum of the first n terms of an A.P. , then the common difference is

If ^ n P_5 = 20 ^nP_3 find the value of n

If ^nP_4=12xx ^nP_2 , find n.

If ^nP_4=12xx ^nP_2 , find n.