For an A.P. if ` a=1, d=4.` What is the value of `n`, if `t_(n)=81?`

Choose the correct alternative from those given below each question: For an A.P. a=1 and d=4. What is the value of n , if t_n=81?

For an A.P., a = 3 and d = 5 . What is the value of n, If t_(11)=263

If for an A.P., d=20, what is the value of t_6-t_2?

For an A.P. if t_(8) =6, d = - 2 , then what is the value of a ?

Choose the correct alternative: For an A.P., t_1=2, t_n=41 and S_n=860 . What is the value of n ?

For an A.P. , if t_(n)=24, n=12, d=2, then what is the value of a?

If for an A.P., d=10 , what is the value of t_(6)-t_(2) ?

If for an A.P., a= 10.5 , d= 0 , dn = 101, then what is the value of t_(n) ?

Choose the correct alternative from those given below each question: For an A.P. , if t_n =24,n=12,d=2, then what is the value of a?

For an A.P, if a=-3 and d=4 , then find t_n .