Question : Directions: Select the number from among the given options that can replace the question mark (?) in the following series.
39, 78, 117, 156, ?, 234
Option 1: 205
Option 2: 195
Option 3: 185
Option 4: 175
Correct Answer: 195
Solution :
Given:
39, 78, 117, 156, ?, 234
Add 39 to each number to obtain the next number of the series –
39 + 39 = 78; 78 + 39 = 117; 117 + 39 = 156; 156 + 39 = 195; 195 + 39 = 234
So, the missing number is 195. Hence, the second option is correct.
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