Question
In each of the following number series, one term is
missing. Find the missing term. 4, 9, 17, 30, 50, ?, 119Solution
ATQ, Look at the differences: 9 - 4 = 5 17 - 9 = 8 30 - 17 = 13 50 - 30 = 20 ? - 50 = 29 119 - ? = 40 Now the second differences are: 8 - 5 = 3 13 - 8 = 5 20 - 13 = 7 29 - 20 = 9 40 - 29 = 11 So the pattern is +3, +5, +7, +9, +11 in second difference. Therefore, missing term = 50 + 29 = 79
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