# Number Series Tricks, Questions and Videos

Number Series Important Questions - Page 6
Number Series Video Lecture - Page 7

PRIME NUMBERS : A prime number is a a counting number greater then 1, which is divisible only by 1 and by itself. For example: 2, 3, 5, 7, 11, etc.

PERFECT SQUARE : A whole number whose square root is also a whole number is called a perfect square. For example: 4, 9, 16, etc.

PERFECT CUBE : A whole number whose cube root is also a whole number is called a perfect cube. For example: 1, 8, 27, 64, etc.

## Arithmetic Progression (AP)/ Arithmetic Series

An arithmetic progression is the sequence of numbers in which a number in the series is obtained by adding a constant number to the previous number in the series.
The sum of first n terms of the series s=n2{2a+(n−1)d}
Where a is the first term and d is the common difference.
The sum of the series (of all n terms)
= n2{a+l}=n2{2a+(n−1)d}
Where ‘a’ is the first term and ‘l’ is the last term

For example,
2, 5, 8, 11 ……. n common difference = 3
9, 15, 21, 27………. n common difference = 6

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## 3 Responses to “Number Series Tricks, Questions and Videos”

1. Comment made by Sohan on Mar 20th 2019 at 12:32 am: Reply

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