Question : Directions: Which number from among the given options can replace the question mark (?) in the following series?
31, 97, ?, 259, 355, 461
Option 1: 127
Option 2: 234
Option 3: 189
Option 4: 173
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Correct Answer: 173
Solution :
Given:
31, 97, ?, 259, 355, 461
The difference between the numbers of the given series holds the common difference of 10, as shown below –
So, 173 is the missing number of the series. Hence, the fourth option is correct.
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