Question:The unit's digit in the product `(3127)^173` is:
A 1
B 3
C 7
D 9
/118
+ Answer
C
+ ExplanationUnit digit in `(3127)^173` = Unit digit in `(7)^173`
Now, `7^4` gives unit digit 1.
`:. 7^172 = (7^6)^43` gives unit digit 1.
`:. 7^173` gives unit digit=`(1 xx 7)=7`.
