number properties

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sud21: Master | Next Rank: 500 Posts; Posts: 344; Joined: Sat Nov 12, 2011 3:21 amFollowed by: 2 members; Thanked: 1 times

by sud21 » Fri Jan 27, 2012 9:35 am

k = 4^9 * 5^ 17, how many digits does k have?

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Source: Beat The GMAT — Problem Solving | Fri Jan 27, 2012 9:35 am

bryan88: Master | Next Rank: 500 Posts; Posts: 120; Joined: Mon Nov 07, 2011 10:54 pm; Location: Delhi; Thanked: 5 times

by bryan88 » Fri Jan 27, 2012 10:13 am

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