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Multiple choice

Directions: Identify the missing number in the given series. 3, 3, 5, ?, 15, 23, 33

  1. 6

  2. 7

  3. 9

  4. 12

  5. 15
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The differences are: 3-3=0, 5-3=2, ?-5=x, 15-?=y, 23-15=8, 33-23=10. The differences are 0, 2, 4, 6, 8, 10. So 5+4=9.

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