Question : Directions: Select the number that can replace the question mark (?) in the following series.
1, 1, 2, 3, 7, 22, ?
Option 1: 157
Option 2: 156
Option 3: 155
Option 4: 152
Correct Answer: 155
Solution :
Given:
1, 1, 2, 3, 7, 22, ?
Multiply the first two terms and then add 1 to obtain the third term and follow the same pattern for the next term.
(1 × 1) + 1 = 2; (1 × 2) + 1 = 3; (2 × 3) + 1 = 7; (3 × 7) + 1 = 22; (7 × 22) + 1 = 155
So, 155 is the required term in the given series. Hence, the third option is correct.
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