[" 46) For an A.P.,"S_(2n)=3S_(n)" .The value of "(S_(3n))/(S_(n))" is equal to "],[[" a) "4," b) "6," c) "8," d) "10]]

If S_(3n)=2S_n then find the value of S_(4n)/S_(2n)

In an A.P., if S_(n) = n(4n + 1), then the value of S_(20) is

If in an A.P., S_(2n)=3.S_(n) then S_(3n) : S _(n) = (a)5 (b) 6 (c)7 (d)8

If in an A.P.S_(n)=n^(2)p and S_(m)=m^(2)p, then S_(p) is equal to

If S_(n), denotes the sum of n terms of an AP, then the value of (S_(2n)-S_(n)) is equal to

S_(n) is the sum of n terms of an A.P. If S_(2n)= 3S_(n) then prove that (S_(3n))/(S_(n))= 6

Let S_(n) denote the sum of first n terms of an A.P. If S_(2n) = 3S_(n) , then the ratio ( S_(3n))/( S_(n)) is equal to :

For an A.P., S_(1)=6 and S_(7)= 105 . Prove that S_(n): S_(n-3) = (n+ 3): (n-3)

If S_n , denotes the sum of n terms of an AP, then the value of (S_(2n)-S_n) is equal to