What will come at the place of question mark?
2, 4, 7, 10, 13, 17, ?
Show answer & explanation
Correct answer: A
Explanation
Series 1 (odd positions: 1st, 3rd, 5th, and 7th terms):
2⟶7⟶13⟶?
7−2=5
13−7=6
Following the alternate increment pattern (5,6,5…), the next difference will be 5.
7th term=13+5=18
Series 2 (even positions: 2nd, 4th, and 6th terms):
4⟶10⟶17
10−4=6
17−10=7
Here the difference (6,7…) is being used.
Since we need to find the next term (7th term) of the series, which belongs to Series 1:
The number that comes in place of the question mark (?) = 13+5=18
Hence, the correct answer is option 18.