If `rgt0 and t^(t)=6.25r^(t+2)`, then r=

If T_(r)=r(r^(2)-1), then find sum_(r=2)^(oo)(1)/(T)

If r=t+2 and s+2=t , then sr=

Let t_r=2^(r/2)+2^(-r/2) then sum_(r=1)^10 t_r^2=

Let t_r=2^(r/2)+2^(-r/2) then sum_(r=1)^10 t_r^2=

If for a G.P., t_6/t_3 = 1458/54 , then r = …………………

If rgt0,-pilethetalepi and r,theta satisfy rsintheta=3 , r=4(1+sintheta) then no. of possible solutions of (r, theta) is

If t_r denotes the r^(th) term of an G.P. and t_1 t_5 t_10 t_16 t_21 t_25 = 512 , then the value of its 13^(th) term is :

If t_r denotes the r^(th) term of an G.P. and t_1 t_5 t_10 t_16 t_21 t_25 = 512 , then the value of its 13^(th) term is :

Resistance of a resistor at temperature t^(@)C is R_(f)=R_(0)(1+alpha t+beta t^(2)) . Here R_(0) is the resistance at 0^(@)C .The temperature coefficient of resistance at temperature t^(@)C is