If a1 = 1 and an+1= 2an + 5, n = 1, 2 .. , then a30 is equal to ?	Choose the correct answer
A) a. 5*2^99-6
B) b. 5*2^99+6
C) c. 6*2^29 - 5
D) d. 6*2^99-5
E) e. 6*2^99-6
Here is my solution:   an+1=2an+5............(1)   lets ADD 5 to both sides....   so (an+1) + 5= 2 (an+5)....................taking 2 as common factor   now a1=1. so for n=1, an+5=6.......   putting n=1. we get both sides as,   a2 + 5= 2 * 6 ..............as ( an+5=6 .......(for n=1)..)   a2= 2 *6 - 5   a2= 2 * 2 *3 - 5   a2= 2^2 *3 - 5................. so with same progression   a30= 2^30 * 3 - 5   a30=2 * 2^29 * 3 - 5   a30= 6 * 2^29 - 5   c. 6*2^29 - 5
<result>C</result>
If a1 = 1 and an+1= 2an + 5, n = 1, 2 .. , then a30 is equal to ?