Multiple choice

Directions: Find the odd one.

1, 3, 10, 21, 64, 129, 356, 777

  1. 21

  2. 10

  3. 356

  4. 777
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

a * 2 + 1, b * 3 + 1, c*2 + 1, d * 3 + 1 and so on

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