Question : Directions: In the following question, a series is given with one number missing. Select the missing number from the given alternatives.
9, 19, 37, 75, 149, ?
Option 1: 297
Option 2: 298
Option 3: 300
Option 4: 299
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Correct Answer: 299
Solution :
Given:
9, 19, 37, 75, 149, ?
Multiply the terms by 2. Then, alternately add and subtract 1 from the result to get the following terms.
(9 × 2) + 1 = 19
(19 × 2) – 1 = 37
(37 × 2) + 1 = 75
(75 × 2) – 1 = 149
(149 × 2) + 1 = 299
So, the required number is 299. Hence, the fourth option is correct.
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