Math, asked by Anonymous, 10 months ago

a number n when divided by 4 leaves the remainder 3 what is the remainder when divided by 8​

Answers

Answered by amitnrw
2

given : A number 'n' when divided by 4 leaves a remainder 3.

To Find :  remainder when 'n' is divided by 8  

Solution:

A number 'n' when divided by 4 leaves a remainder 3.

=> n =  4k  +  3

4k  +  3  = 8p  + r  

r is the remainder

r = 4k  +  3  - 8p

 now k can be even or odd

Case 1  =  k  = 2m    

r = 4(2m) + 3 - 8p

=> r = 8(m - p) + 3

=> r = 8q + 3

Hence 3 can be remainder

case 2 : k  = 2m  + 1

=> r = 4(2m+ 1 ) + 3 - 8p

=> r = 8(m - p) + 4 + 3

=> r = 8(m - p) + 7

=> r = 8q + 7

Hence 3 can be the remainder

so 3 or 7 can be the remainder

Examples are 11 and 15

15 = 4 x 3 + 3   = 8 x 1  + 7

11 = 4 x 2  + 3  =  8 x 1  + 3

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