Question

if n is prime number and 9n is less than 180 and greater than 81 then 13n-7 is

Answer 1

Explanation:

According to question

= 81 < 9n < 180

= 9 < n < 20

Prime numbers between 9 and 20 are

11,13,17 and 19

13n -7 for each of them is

136,162, 214, 240 respectively.

Answer 2

Given :

n is a prime number .

and ,

9n < 180 and 9n > 81 .

To find :

The value of 13n - 7

Solution :

According to given condition in question ,

9n < 180 and 9n > 81

→ 81 < 9n < 180

→ (1/9) * 81 <  (1/9) * 9n <  (1/9) * 180

→  9 < n < 20

The prime number is in between 9 and 20 . All prime numbers between them are - 11,13,17 and 19

then ,

( 13n - 7 ) → ( 13*11 - 7 ) or ( 13*13 - 7 ) or ( 13*17 - 7 ) or ( 13*19 - 7 )

              →   136 or 162 or 214 or 240

13n - 7 for 11 , 13 , 17 and 19  are 136 , 162 , 214 and 240