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)
p,x,y are all integers
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Source: Beat The GMAT — Data Sufficiency |
