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Last Updated on May 4, 2023
GMAT OFFICIAL GUIDE PS
Solution:
For the sixth term, we need to substitute 6 for n, and for the fifth term, we need to substitute 5 for n. Then we’ll find the difference between the two terms.
Let’s first plug 6 in for n.
6 + 2^(6-1)
6 + 2^5
6 + 32 = 38
Next let’s plug 5 in for n.
5 + 2^(5-1)
5 + 2^4
5 + 16 = 21
Thus, the difference between the 6th and 5th term of the sequence is 38 – 21 = 17.
Answer: E
