What is the rightmost non-zero digit of $30^{58}\cdot 17^{85}?$

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VJesus12: Legendary Member; Posts: 2276; Joined: Sat Oct 14, 2017 6:10 amFollowed by: 3 members

by VJesus12 » Sun Jan 17, 2021 4:25 am

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What is the rightmost non-zero digit of $30^{58}\cdot 17^{85}?$

A. 0
B. 1
C. 3
D. 7
E. 9

Answer: C

Source: e-GMAT

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Source: Beat The GMAT — Problem Solving | Sun Jan 17, 2021 4:25 am

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