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rahul goyal: Junior | Next Rank: 30 Posts; Posts: 18; Joined: Thu Aug 05, 2010 3:44 am

by rahul goyal » Sun Aug 08, 2010 10:07 pm

Find the sum of the digits in the unit place of all numbers formed with the help of 3,4,5,6 taken all at a time.

Source: Beat The GMAT — Problem Solving | Sun Aug 08, 2010 10:07 pm

kvcpk: Legendary Member; Posts: 1893; Joined: Sun May 30, 2010 11:48 pm; Thanked: 215 times; Followed by:7 members

by kvcpk » Sun Aug 08, 2010 10:19 pm

rahul goyal wrote:Find the sum of the digits in the unit place of all numbers formed with the help of 3,4,5,6 taken all at a time.

What is the source? Is repetition allowed? If repitition is allowed, the sum is undefined.

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