Question 29
Select the number that can replace the question mark (?) in the following series.
8, 13, 23, 43, ?, 163, 323
Solution
The given series is 8, 13, 23, 43, ?, 163, 323
The difference of the numbers is becoming twice as shown below
The next difference should be 40.
Let the required number = a
$$\Rightarrow$$ a - 43 = 40
$$\Rightarrow$$ a = 83
$$\therefore\ \ $$Required number = 83
Hence, the correct answer is Option C
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