The digit in the unit's place of [(251)⁹⁸ + (21)²⁹ - (106)¹⁰⁰ + (705)³⁵ - 16⁴ + 259] is :

A. 1

B. 4

C. 5

D. 6

Answer: Option B

Solution(By Examveda Team)

Unit digit in [(251)⁹⁸ + (21)²⁹ - (106)¹⁰⁰ + (705)³⁵ - 16⁴ + 259]
= unit digit in (1 + 1 - 6 + 5 - 6 + 9)
= 4