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6, 13, 18, 25, 30, 37, 40

Question:
6, 13, 18, 25, 30, 37, 40

[A].

25

[B].

30

[C].

37

[D].

40

Answer: Option D

Explanation:

The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.

So, 40 is wrong.