Question

a≡b mod n means that a=b+kn, where k is an integer. What does this actually mean mean??

Answer 1

a≡b mod n
This means a=b+kn
This actually means that the difference between a and b is an integral multiple of n
For Example:
16≡10 mod 2
here the difference between 16 and 10=>16-10=6
6 is an integral multiple of 2
here k=3
\[16=10+3 \times 2\]

Answer 2

Thanks for clarifying