Which of the following cannot be the square of an integer
A. 275625
B. 385641
C. 227529
D. 261121
E. 426408
The OA is the E.
How can I show that the correct answer is the option E? Can any expert help me?
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Which of the following cannot be the square of an . . . .
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GMATGuruNY
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1² = 1.VJesus12 wrote:Which of the following cannot be the square of an integer
A. 275625
B. 385641
C. 227529
D. 261121
E. 426408
2² = 4.
3² = 9.
4² = 16.
5² = 25.
6² = 36.
7² = 49.
8² = 64.
9² = 81.
10² = 100.
The units digit for a perfect square must be one of the blue values above:
0, 1, 4, 5, 6, 9.
Since a perfect square cannot have a units digit of 8, option E cannot be a perfect square.
The correct answer is E.
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As a tutor, I don't simply teach you how I would approach problems.
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The units digit of any perfect square can only be 1, 4, 6, 9, or 0. Thus, 426408 cannot be the square of an integer.VJesus12 wrote:Which of the following cannot be the square of an integer
A. 275625
B. 385641
C. 227529
D. 261121
E. 426408
Answer: E
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