If p,x,y are integers, what is the unit digits of p^xy?
1. the unit digit of p^x is 1.
2. the unit digit of p^y is 1.
oa D
1. the unit digit of p^x is 1.
2. the unit digit of p^y is 1.
oa D
let's beat GMAT.
Should be (D). Here's how:
P^xy = (P^x)^y
Now as per (i), P^x has unit's digit equal to 1. So whatever the value of y (P^x)^y will always also have unit's digit equal to 1
Similarly if we take (ii), P^y has unit's digit equal to 1. So whatever the value of x (P^y)^x will always also have unit's digit equal to 1
Hence D (Each stmt alone is sufficient)
