What is the unit digit in(795 - 358)?
0
4
6
7
Explanation:
Unit digit in 795 = Unit digit in [(74)23 x 73]
= Unit digit in [Unit digit in 2401 23] x (343)]
= Unit digit in (123 x 343)
= Unit digit in (343)
= 3
Unit digit in 358 = Unit digit in [(34)14 x 32]
= Unit digit in [Unit digit in (81)14 x 32]
= Unit digit in [(1)14 x 32]
= Unit digit in 1 x 9
= Unit digit in 9
= 9
Unit digit in (795 - 358) = Unit digit in (343 - 9) = Unit digit in (334) = 4.
So, Option b is the answer.