In the sequence S, each term after the first is twice the previous term. If the first term of sequence S is 3, what is the sum of the 14th and 15th terms in sequence S?	Choose the correct choice from the following answers.
A) 3(2^16)  B) 9(2^15)  C) 21(2^14)  D) 9(2^14)  E) 9(2^13)
The terms in the sequence can be shown as   a(n) = 2* a(n-1)   So, the sequence will look like: 3, 2*3, (2^2) *3,...   And the nth term will be given as 2^(n-1) *3   Therefore, a(14) = (2^13)*3, a(15) = (2^14) *3,   So, a(14) + a(15) = (2^13) *3 + (2^14) *3   = 3* (2^13) *(1+2) = 3* (2^13) *3   = 9 * (2^13)   Answer : 9(2^13)
<result>E</result>
In the sequence S, each term after the first is twice the previous term. If the first term of sequence S is 3, what is the sum of the 14th and 15th terms in sequence S?