Which of the following numbers will replace the question mark (?) in the given series? 8, 18, 38, 78, 158, ?

SSC GD Constable Exam Questions

Question:

Which of the following numbers will replace the question mark (?) in the given series?

8, 18, 38, 78, 158, ?

Options:

1.   318
2.   340
3.   290
4.   268

Answer:

Option 1: 318

Explanation:

Let's analyze the pattern in the given series:

 * 8 + 10 = 18

 * 18 + 20 = 38

 * 38 + 40 = 78

 * 78 + 80 = 158

We can observe that the difference between consecutive numbers is increasing by 10 in each step.

So, the next difference should be 80 + 10 = 90.

Therefore, the missing number is 158 + 90 = 318.

Hence, Option 1 is the correct answer.