Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 19, 39, 77, 155, ?
Option 1: 288
Option 2: 236
Option 3: 309
Option 4: 311
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Correct Answer: 309
Solution : Given: 19, 39, 77, 155, ?
Multiply the number by 2 and then add and subtract 1 alternately – (19 × 2) + 1 = 38 + 1 = 39 (39 × 2) – 1 = 78 – 1 = 77 (77 × 2) + 1 = 154 + 1 = 155 (155 × 2) – 1 = 310 – 1 = 309
Thus, the required missing number in the series is 309. Hence, the third option is correct.
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Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 2,11, 28, 53, ?, 127
Option 1: 86
Option 2: 92
Option 3: 74
Option 4: 98
Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 1, 8, 16, 27, 43, 66, 98, ?
Option 1: 141
Option 2: 111
Option 3: 103
Option 4: 122
Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 2, 4, 7, 11, 16, 22, ?
Option 1: 31
Option 2: 54
Option 3: 29
Option 4: 28
Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 3, 10, 24, ?, 73, 108
Option 1: 37
Option 2: 45
Option 3: 52
Option 4: 32
Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series. 3, 7, 3, 8, 6, 10, 18, 13, ?, 17, 360, 22
Option 1: 32
Option 2: 18
Option 3: 56
Option 4: 72
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