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Omni-MATH / When 5³⁵−6²¹ is evaluated, what is the units (ones) digit?

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problem

When 535−6215^{35}-6^{21} is evaluated, what is the units (ones) digit?
Plain-text mathematical notation (without MathML)
When 5³⁵−6²¹ is evaluated, what is the units (ones) digit?
Original LaTeX notation
When $5^{35}-6^{21}$ is evaluated, what is the units (ones) digit?

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