Question : Directions: In the following question, a series is given with one number missing. Choose the correct alternative from the ones given that will complete the series.
7, 19, 42, 87, ?
Option 1: 136
Option 2: 176
Option 3: 172
Option 4: 216
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Correct Answer: 176
Solution :
Given:
7, 19, 42, 87, ?
Let's apply the pattern –
(7 × 2) + 5 = 14 + 5 = 19
(19 × 2) + 4 = 38 + 4 = 42
(42 × 2) + 3 = 84 + 3 = 87
(87 × 2) + 2 = 174 + 2 = 176
176 is the missing number. Hence, the second option is correct.
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