What is the next number in the sequence 2, 7, 17, 37, 77, ... ?

Answer and explanation

Correct answer: B. 157

  1. Step 1: 2 to 7: 2 × 2 + 3 = 7. 7 to 17: 7 × 2 + 3 = 17. The rule is double then add 3. Step 2. 77 × 2 + 3 = 157. Answer: 157. Why not the others: 154: This doubles but forgets to add 3. 117: This adds the last difference of 40. 158: This adds 4 instead of 3.

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