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The rightmost non-zero digit of the number $$30^{2720}$$ is
1
3
7
9
Rightmost non-zero digit of $$30^{2720}$$ is same as rightmost non-zero digit of $$3^{272}$$.
272 is of the form 4k.
All $$3^{4k}$$ end in 1.
=> Right most non-zero digit is 1.
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