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
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Correct Answer: 165
Solution : Given: 10, 15, 25, 45, 85, (?)
Here, the difference between terms is twice the difference between the previous number – 10 + 5 = 15, 15 + 10 = 25, 25 + 20 = 45, 45 + 40 = 85, 85 + 80 = 165
So, 165 is the required missing term in the series. Hence, the second option is correct.
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Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 25, 15, ?, −5, −15
Option 1: 20
Option 2: 5
Option 3: 10
Option 4: -1
Question : Directions: Which number will replace the question mark (?) in the following series? 37, 39, ?, 242, 970, 4852
Option 1: 80
Option 2: 122
Option 3: 108
Option 4: 160
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 286, 192, 263, 176, 240, 160, 217, 144, ?
Option 1: 186
Option 2: 194
Option 3: 165
Option 4: 190
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
Question : Directions: Which of the following numbers will replace the question mark (?) in the given series? 137, 114, ?, 91, 183
Option 1: 145
Option 2: 160
Option 3: 125
Option 4: 112
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