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Answer:
2 . 4 at unit place
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Step-by-step explanation:
i) 1,4,9,16,25 are known as perfect square number .
as 1 is square of 1
4 is square of 2
9 is square of 3
16 is square of 4
25 is square of 5
ii) 68 square will have 4 at unit place
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