Question 27

In the following question, select the missing number from the given alternatives.
9, 23, 50, 103, 208, ?

Solution

Given series is 9, 23, 50, 103, 208, ?

The logic here is difference of differences of the numbers is double the previous difference.

The next number should be 104 and the difference between the required number and 208 should be 209.

$$\therefore\ $$Required number = 208 + 209 = 417

Hence, the correct answer is Option C

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In the following question, select the missing number from the given alternatives.9, 23, 50, 103, 208, ?