Which of the following numbers would have digit 9 at unit place? * 49² 94² 39² 73²
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Which of the following numbers would have digit 9 at unit place? * 49² 94² 39² 73²
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73 square alone have 9 in its unit place
To see the unit place we have to find the square of the unit digit.
i) 9^2 = 81; 49^2 does not have 9 at unit digit.
ii)4^2 = 16; 94^2 does not have 9 at unit digit.
iii)9^2 = 81; 39^2 does not have 9 at unit digit.
iv)3^2 = 9; 73^2 has 9 at unit digit.