**Example: Number Series Questions for IBPS PO Exam**

**Question:**1, 4, 27, 256, ?, 46656

**Solution:**The trick behind solving this number series question is that when we observe the series, we find that the series is increasing at a very high pace. The numbers are either multiples, squares or cubes of consecutive natural numbers.

As 1¹ = 1, 2² = 4, 3³ = 27, 4⁴ = 256, 5⁵ = 3125.

Therefore, the missing number is 3125.

**Example: Number Series Questions for IBPS PO Exam**

**Question:**7, 26, 63, 126, 215, 342

**Solution:**In this number series question we need to find the wrong number which is placed in the series.

When we observe the series, we find that the numbers in the series are one less than the cube of the natural numbers starting from 2.

Therefore, The wrong number is 126.

**Example: Number Series Questions for**

**IBPS PO Exam**

**Question:**7, 11, 4, 18, 15, 5

**Solution:**The trick behind solving this number series question is that when we observe the series we find the number 7, 11, 4, 18, 14. They are in increasing and decreasing order. It's tough to analyse. But when we add 7 and 4 we get 11 and when we add 4 and 14 we get 18. This means that when we add alternate numbers, we get the middle number that is placed between them.

Therefore, The wrong number placed in the series is 15.

**Example: Number Series Questions for**

**IBPS PO Exam**

**Question:**12, 17, 24, 33, 52, ?

**Solution:**

When we observe the series, we find that the series is increasing gradually. So we can find the missing number by finding the difference between two numbers.

So when we subtract 17 - 12 = 5, 24 - 17 = 6, 33 - 24 = 10, 52 - 33 = 19.

As there is no specific pattern, we further find the difference of the differences.

6 - 5 =1, 10 - 6 = 4, 19 - 10 = 9, 35 - 19 = 16.

When we observe the difference, of the differences we find that these numbers are the squares of natural number starting from 1.

Therefore, the missing number is 87.

However, if you can't find the logic behind the series within 30 seconds, it's advisable to move on to another question and come back at the end when the time is left.

**Number Series Questions for Practice**

**Question:**What would come in place of question-mark (?) for the following question?

1 ? 9 16 25

1) 2 2) 5 3) 3 4) 4 5) None of these

**Question:**Find out the wrong number 60, 48, 38, 28, 24, 20, 18

1) 60 2) 48 3)38 4)28 5) 24

Do write your answers in the comment section.

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