How many 2 digit numbers, which is a square with last digit as 8?

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logic
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.

niranchana

  • Jul 17th, 2017
 

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