Which of the following cannot be perfect square?
(A)1681 (B)1849 (C)2116 (D)1762
Anupkashyap:
perfect square or perfect square root??
Perfect squares have any one of 1,4,5,6,9 in their unit's place, find the one which doesn't end with these.
right..
What I typed is a preliminary test, you must verify further to see whether it is a perfect square.
in this queation, with just tat condition u can conclude tat D is the answer
Works fine for this, but I am talking about other questions which have these digits in their unit's place.
ya
Answers
Answered by
7
1762 has 2 in the units digit. so it cannot be a perfect square.
unit digits of perfect squares can be only:
1*1 = 1, 2*2 = 4, 3*3 = 9, 4*4 = 6 , 5*5 = 5
6*6 = 6 7*7 = 9 8*8 = 4 9*9 = 1
hence 1,4,6,5,9 are the only digits in the units place in perfect squares.
unit digits of perfect squares can be only:
1*1 = 1, 2*2 = 4, 3*3 = 9, 4*4 = 6 , 5*5 = 5
6*6 = 6 7*7 = 9 8*8 = 4 9*9 = 1
hence 1,4,6,5,9 are the only digits in the units place in perfect squares.
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Answered by
1
d)1762 is not a perfect square
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