1.

What should come in place of the question mark '?' in the following number series?21, 34, 55, 89, ?, 2331. 1442. 1373. 1264. 1645. 135

Answer» Correct Answer - Option 1 : 144

Calculation

The series follows following pattern

21 + 13 = 34

34 + 21 = 55

55 + 34 = 89

89 + 55 = 144

144 + 89 = 233

∴ The value of ? is 233


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