Aptitude Hack#82(16-5-19)

Question:

Find the unit’s digit in (264)^102 + (264)^103

   A )   0
   B )   1
   C )   2
   D )   3

Answer: A) 0

Explaination :

 Required unit’s digit = unit’s digit in
 (4)^102 + (4)^103.

now, 4^2  gives unit digit 6.

(4)^102 gives unit digit 6.

(4)^103 gives unit digit of the product 
(6 x 4) i.e., 4.

Hence, unit’s digit in (264)^102 + (264)^103
 = unit’s digit in (6 + 4) = 0