In the formula `a_(n) = 3.6, a = - 18.9, d = 2.5, n = ……………

a_(n) = 9-5n, a_(4) = ………….

a_(n) = 2^(n), a_(5) = ………

Fill in the blanks in the following table , given that a is the first term, d the common difference and a_(n) the nth term of the A.P: (i) a=7, d=3, n=8, a_(n)=? (ii) a= - 18, n=10, a_(n)=0, d=? 0= -18+(10-1) d rArr 10d-d=18 9d=18 rArr d=(18)/(9)=2 d=2 (iii) a=? , d= -3, n=18, a_(n)= - 5 (iv) a= -18.9, d=2.5, n=?, a_(n)=3.6

a_(n) = n/(n+2) , a_(3) = ……….

In an AP: (i) Given a=5, d=3, a_(n) = 50 , find n and S_(n) (ii) given a=7, a_(13) = 35 , find d and S_(13) . (iii) given a_(12) = 37, d=3 , find a and S_(12) (iv) given a_(3) = 15, S_(10) = 125 , find d and a_(10) (v) given a=2, d= 8, S_(n) = 90 , find n and a_(n) (vi) given a_(n) = 4, d=2, S_(n) = - 14 , find n and a. (vii) given l=28, S= 144, and there are total 9 terms, find a.

In an AP: (i) Given a=5, d=3, a_(n) = 50 , find n and S_(n) (ii) given a=7, a_(13) = 35 , find d and S_(13) . (iii) given a_(12) = 37, d=3 , find a and S_(12) (iv) given a_(3) = 15, S_(10) = 125 , find d and a_(10) (v) given a=2, d= 8, S_(n) = 90 , find n and a_(n) (vi) given a_(n) = 4, d=2, S_(n) = - 14 , find n and a. (vii) given l=28, S= 144, and there are total 9 terms, find a.

In an AP: (i) Given a=5, d=3, a_(n) = 50 , find n and S_(n) (ii) given a=7, a_(13) = 35 , find d and S_(13) . (iii) given a_(12) = 37, d=3 , find a and S_(12) (iv) given a_(3) = 15, S_(10) = 125 , find d and a_(10) (v) given a=2, d= 8, S_(n) = 90 , find n and a_(n) (vi) given a_(n) = 4, d=2, S_(n) = - 14 , find n and a. (vii) given l=28, S= 144, and there are total 9 terms, find a.

If 2^(2010)=a_(n)10^(n)+a_(n-1)10^(n-1)+………..+a_(2)10^(2)+a_(1)*10+a_(0) , where a_(i) in {0, 1, 2, ………, 9} for all i=0,1, 2,3, …………, n , then n=