Free Practice Question
PS · Problem Solving
505-555
Exponents/Powers
What is the remainder when is divided by 10?
Answer Choices
Correct answer marked belowA
1
5
Correct
C
3
D
7
E
9
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Explanation
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Official Explanation
Official
By examining the cyclicity of powers, we find that the unit digits of powers of 5 are always 5. Since…
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Comments
2
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R
RiteshMar 21, 2024
Love how you solved this
I
IshanJan 26, 2024
thanks for posting
What this question tests
What it tests
Your grasp of exponent rules — multiplying and dividing powers, power-of-a-power, and negative/zero exponents.
Common trap
Adding exponents when multiplying bases that have the same exponent, or confusing (x^a)^b with x^(a·b).
Details
Difficulty
505-555
Type
PS
Category