Find the constant AAA for the solution an=A(2n)a_n = A(2^n)an=A(2n) of the recurrence an=2an−1a_n = 2a_{n-1}an=2an−1 with a0=5a_0 = 5a0=5.
A=2A=2A=2
A=5A=5A=5
A=10A=10A=10
A=2.5A=2.5A=2.5