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Answer :
One’s digit of any number depends on the one’s digit of the number of which it is square of. Here we have:
(i) One’s digit in the square root of 9801 can be 1 or 9.
(ii) One’s digit in the square root of 99856 can be 4 or 6.
(iii) One’s digit in the square root of 998001 can be 1 or 9.
(iv) One’s digit in the square root of 657666025 can be 5.