Question : Directions: Which number will replace the question mark (?) in the following series? 12, 25, 51, 103, ?, 415, 831
Option 1: 208
Option 2: 207
Option 3: 206
Option 4: 200
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Correct Answer: 207
Solution : Given: 12, 25, 51, 103, ?, 415, 831
Multiply the previous term by 2 and add 1 to the resultant term to get the next term. (12 × 2) + 1 = 25; (25 × 2) + 1 = 51; (51 × 2) + 1 = 103; (103 × 2) + 1 = 207; (207 × 2) + 1 = 415; (415 × 2) + 1 = 831
So, 207 is the missing term in the series. Hence, the second option is correct.
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Question : Directions: Which number should replace the question mark (?) in the following number series? 49, 54, 44, 59, ?, 64, 34
Option 1: 51
Option 2: 36
Option 3: 39
Option 4: 44
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 214, 207, 193, ?, 144, 109
Option 1: 172
Option 2: 117
Option 3: 175
Option 4: 170
Question : Directions: Which number will replace the question mark (?) in the following series? 5, 12, 26, ?, 110, 222
Option 1: 52
Option 2: 56
Option 3: 54
Option 4: 50
Question : Directions: Which number will replace the question mark (?) in the following series? 10, 15, 25, 45, 85, (?)
Option 1: 160
Option 2: 165
Option 3: 170
Option 4: 150
Question : Directions: Which number should replace the question mark (?) in the following number series? 642, 598, 554, ?, 466, 422
Option 1: 514
Option 2: 524
Option 3: 500
Option 4: 510
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