Easy Tutorial
For Competitive Exams

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.

Share with Friends
Privacy Copyright Contact Us