Multiple choice

Find the missing term in the following number series. 40 60 99 176 310 ?

  1. 520

  2. 420

  3. 610

  4. 740

  5. 480
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A Correct answer
Explanation

This series has a constant third difference of 19. The first differences are 20, 39, 77, 134, and the next is 210 (134+76 where 76 is 57+19). So 310+210=520.

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