Question

For an integer n, if n mod 7 = 3 then n2 mod 7 =​

Answer 1

Answer:

(a*b) mod c = ( (a mod c)*(b mod c)) mod c

Now here n mod 5 = 3

Now (n^2) mod 5 = (n*n) mod 5

=> (n^2) mod 5 = ((n mod 5)*(n mod 5)) mod 5

=> (n^2) mod 5 = ( 3*3) mod 5

=> (n^2) mod 5 = (9) mod 5 = 4

mark brainliest