If the sequence X(1), X(2), X(3),...,X(n),..is such that X(1) = 3 and X(n+1) = 2X(n) - 1 for n = 1, then X(20)-X(19) =
2^19
2^20
2^21
2^20 - 1
2^21 - 1
The ANS is A ,but how to solve it?
2^19
2^20
2^21
2^20 - 1
2^21 - 1
The ANS is A ,but how to solve it?
