Multiple choice

Find out the missing number in the series: $2 + 7 + 9 + 3 + 8 + 11 + 4 + 9 + 13 +$ ___$ + 10 + 15$.

  1. $2$
  2. $3$
  3. $4$
  4. $5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The series follows a pattern of three repeating groups: (2, 7, 9), (3, 8, 11), (4, 9, 13), and (5, 10, 15). In each group, the first number increases by 1, the second by 1, and the third by 2. The missing number is the start of the final group, which is 5.

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