What it is the difference between the sixth and the fifth terms of the sequence 2, 4, 7, ______

What it is the difference between the sixth and the fifth terms of the sequence 2, 4, 7, _______ whose n^thterm is n + 2^n-1 ?

A 3

B 6

C 16

D 17

Correct Answer: Option D

Solution:

অনুবাদঃ এই সিরিজের ৬ষ্ঠ ও ৫ম পদের পার্থক্য কত যেখানে বিন্যস্ত সংখ্যাগুলো 2, 4, 7, .... যার n তম পদ n + 2^n-1 ?

n^th term	6^th term	5^th term	6^th term - 5^th term
n + 2^n-1	6 + 2^6-1 = 38	5 + 2^5-1 = 21	38 - 21 = 17