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Answer:
a]81 ^2
Step-by-step explanation:
we know 81=9.9
similarly 81 ^2=[81][81]
unit digit of any no. multiplied with a no. of same unit digit will have unit digit as square of the unit digits no.
for eg:
48.48 = 2304
since 8 ^2=64 ,unit digit is 4 here
for 81 ^2 it will be xxx1 since 1 ^2 =1
pls mark me brainliest.