Question

Select the number that can replace the question mark (?) in the following series. 1, 1, 2, 3, 7, 22, ?

• A. 152
• B. 156
• C. 157
• D. 155

Answer 1

Answer:

D. 155

1 × 1 + 1 = 2 2 × 3 + 1 = 7 3 × 7 + 1 = 22 7 × 22 + 1 = 155