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Q.

Which one of the following can't be the square of natural number?


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a

143642

b

27859

c

57896

d

27896 

answer is A.

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Detailed Solution

Given numbers are, 143642, 27859, 57896 and 27896.
As we know that all the perfect square number ends with 1,4,9,6,5,00.
∴143642 is not the square of a natural number because it ends with 2.
Therefore, option (1) is correct.
 
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