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
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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