, where a, b, c are in A.P. andl a l < 1, l b l < 1, l c l < 1, then x, y, z are in
2.
The sum of the series 1 + 1/4 - 2 ! +1 /16 4 ! + 1/64 - 6 ! + ……… d nf. Is
3.
then tn/Sn =
4.
Let Tr be the rth term of an A.P. whose first term is a and the common difference is d. If for some positive integers m, n, m ≠ n, Tm = 1/n, and Tn = 1/m, then a – d equals
5.
The sum of the f rst n terms of he series 12+ 2 2 + 32+ 2 ⋅ 42+ 52+ 2 ⋅ 62+ ….. Is n ( n + 1 )2/2 when n isven. When n is odd, the sum is
