The unit digit of the expression : $${25^{6251}} \, + $$   $${36^{528}} \, + $$   $${73^{54}} = ?$$

A. 6

B. 5

C. 4

D. 0

Answer: Option D

Solution(By Examveda Team)

25⁶²⁵¹ = 5⁶²⁵¹ = 5 (because unit digit of 5 is always 5)
36⁵²⁸ = 6⁵²⁸ = 6 (because unit digit of 6 is always 6)
73⁵⁴ = 3⁵⁴ = 9(unit digit of 3⁵⁴ = 3² ($$\frac{{54}}{4}$$ = 2 remainder) = 9)
now add all the unit digit 5 + 6 + 9 = 20 = 0