The first and ninth term of a linear sequence(A.P) are the first twelve term of the exponential sequence (G.P).if the seventh term of the linear sequence is 14.calculate
1. the twentieth term of the linear sequence
2. the sum of the first twelve terms of the exponential sequence
how can two terms of an AP be 12 terms of a GP?
I guess you meant first and 12th terms. If so, then
a+6d = 14
a+8d = ar^11
That's not enough to go on, and that 11th power looks intractable. I suspect you have garbled the question. Fix it and maybe we can get somewhere.