Question

If square root of a number is a natural num-
ber, then which one of the following can be 81. Th
the unit digit of the square number?
(A) 9
(B) 3
(A
(C) 7
(D8
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Answer 1

Answer:

9

Step-by-step explanation:

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Answer 2

Answer:

the answer is (A)

Step-by-step explanation:

According to the question

let the natural no. be X

then,x^2=81

therefore X=9

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