Question

How many number lie between square of the following number (a)12 and 13 (b) 25 and 26

Answer 1

Answer:

A) Sq. Of 13=169

Sq of 12=144

Using AP,

An=a+(n-1)d

169=144+(n-1)1

25-1=n

n=24

B) Similarly

676=625+(n-1)1

n=50.

Simple formula,

(Sum of given no. )- 1

Ex--

A) (12+13) - 1 =25-1=24

Hope this will help you