GMAT Prep: Exp

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preciousrain7: Senior | Next Rank: 100 Posts; Posts: 78; Joined: Thu Dec 06, 2007 4:16 pm; Location: NYC, NY; Thanked: 2 times

by preciousrain7 » Thu Dec 27, 2007 2:18 pm

If anyone can please explain how to do this and similar questions I'd really appreciate it.

[/spoiler]OA is B

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Source: Beat The GMAT — Problem Solving | Thu Dec 27, 2007 2:18 pm

StarDust845: Master | Next Rank: 500 Posts; Posts: 158; Joined: Mon Dec 03, 2007 8:32 am; Thanked: 7 times

by StarDust845 » Thu Dec 27, 2007 2:36 pm

n must be 21.

4^11 = 2 ^ 22.

and the 21 5s can be paired up with 21 2s to give 21, 10s.

Hence the 5^21 = 2 * 10^21 hence n = 21.

Calista

Last edited by StarDust845 on Thu Dec 27, 2007 3:37 pm, edited 1 time in total.

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preciousrain7: Senior | Next Rank: 100 Posts; Posts: 78; Joined: Thu Dec 06, 2007 4:16 pm; Location: NYC, NY; Thanked: 2 times

by preciousrain7 » Thu Dec 27, 2007 3:25 pm

StarDust845 wrote:n must be 21.

4^11 = 2 ^ 22.

and the 51 5s can be paired up with 21 2s to give 21, 10s.

Hence the 5^21 = 2 * 10^21 hence n = 21.

Calista

CALISTA, THANK YOU VM!!!!

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