If n=p2 and p is a prime number greater than 5，what is the units digit of n2?

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问题 If n=p² and p is a prime number greater than 5，what is the units digit of n²?

选项 A、1
B、3
C、4
D、7
E、9

答案A

解析 First, all prime numbers greater than 5 are odd numbers with units digit 1,3, 7, or 9. Note that no prime number greater than 5 has units digit 5. The following table summarizes the results for the possible cases.

The correct answer is A.

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If n=p2 and p is a prime number greater than 5，what is the units digit of n2?

GMAT QUANTITATIVE

GMAT

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Ourpreferencesforcertaincolorsare______accordingtothepassage.Whichofthefollowingcouldbethemostsuitabletitle

Therearemanyfactorswhichmayhaveaninfluenceonadultsandchildrenbeingabletoleadahealthylife.Nowadays,peopl

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