How many two digit numbers have their square ending with 8?
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squares of numbers with last digit as 1 will end at 1
squares of numbers with last digit as 2 will end at 4
squares of numbers with last digit as 3 will end at 9
squares of numbers with last digit as 4 will end at 6
squares of numbers with last digit as 5 will end at 5
squares of numbers with last digit as 6 will end at 6
squares of numbers with last digit as 7 will end at 9
squares of numbers with last digit as 8 will end at 4
squares of numbers with last digit as 9 will end at 1
A perfect square wud never carry its last digit as 8 no matter its a 2 digit no. or 3 digit or n number of digits.
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