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Find the value of X in the series: 4, 13, 29, X, 90, 139
1. 61
2. 58
3. 56
4. 54

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Correct Answer - Option 4 : 54

Given series is: 4, 13, 29, X, 90, 139

Pattern of the series is:

22 = 4

32 + 4 = 13

42 + 13 = 29

52 + 29 = 54

62 + 54 = 90

72 + 90 = 139

∴ Value of X is 54

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