What is the unit digit in {(6374)¹⁷⁹³ x (625)³¹⁷ x (341⁴⁹¹)}?

A. 0 

B. 2

C. 3

D. 5

Answer: Option A

Solution(By Examveda Team)

Unit digit in (6374)¹⁷⁹³
= Unit digit in (4)¹⁷⁹³
= Unit digit in [(4²)⁸⁹⁶ x 4]
= Unit digit in (6 x 4) = 4

Unit digit in (625)³¹⁷
= Unit digit in (5)³¹⁷
= 5

Unit digit in (341)⁴⁹¹
= Unit digit in (1)⁴⁹¹
= 1

Required digit
= Unit digit in (4 x 5 x 1)
= 0