Let `{t_n}` be a sequence of integers in G.P. in which `t_4: t_6=1:4a n dt_2+t_5=216.` . Then `t_1i s` `12` b. `14` c. `16` d. none of these

The fifth term of the sequence for which t_1= 1, t_2 = 2 and t_(n + 2) = t_n + t_(n + 1) is

If for a G.P. { t_(n)}, t_(7) : t_(4) =27 and S_(5) =242, and t_(3) .

Find d for an A.P. if (i) t_(10) =20, t_(9) = 18 (ii) t_(n) = 7, t_(n-1) = 10

If for a G.P. { t_(n)},t_(2) =-6 and t_(5) =48 find S_(7) .

Find the first five terms of the sequence for which t_(1)=1,t_(2)=2 and t_(n+2)=t_(n)+t+(n+1)

A sequence { t_n} is given by t_n=n^2-1, n in N then show that it is not an A.P

If in a g.P. { t_(n)) it is given that t_(p+q) =a and t_(p-q) = b then : t_(p) = (A) (ab)^(1/2) (B) (ab)^(1/3) (C) (ab)^(1/4) (D) none of these