GMAT Prep: Functions

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RM: Senior | Next Rank: 100 Posts; Posts: 47; Joined: Sat Jun 16, 2007 10:58 pm

by RM » Thu Jun 28, 2007 7:35 am

For all positive integers m, Fn(m) = 3m when m is odd and Fn(m) = (1/2)m when m is even. Which of the following is equivalent to Fn(9) * Fn(6)?

A. 81
B. 54
C. 36
D. 27
E. 18

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Source: Beat The GMAT — Problem Solving | Thu Jun 28, 2007 7:35 am

mschling52: Master | Next Rank: 500 Posts; Posts: 105; Joined: Mon Sep 18, 2006 12:34 pm; Location: OH; Thanked: 7 times; GMAT Score:780

by mschling52 » Thu Jun 28, 2007 8:09 am

Is it A?

Fn(9) = 3*9 = 27, since 9 is odd
Fn(6) = (1/2)*6 = 3, since 6 is even

27*3 = 81

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moneyman: Master | Next Rank: 500 Posts; Posts: 468; Joined: Sat Mar 03, 2007 10:17 pm; Thanked: 5 times

by moneyman » Thu Jun 28, 2007 9:20 am

Is it A??

Maxx

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mikeclarke44: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Sat Jun 09, 2007 11:57 am

by mikeclarke44 » Sat Jul 07, 2007 11:04 am

No the answer is 27
9*6 = 54 which is even so you preform the (F) 1/2 *m

I don't follow this either, it seems it should be 81.

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sudhirsk: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Mon Nov 27, 2006 4:55 pm

by sudhirsk » Sat Jul 07, 2007 12:33 pm

I think the answer is function of 27.
3* 27 = 81. since 27 is odd.

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manred: Junior | Next Rank: 30 Posts; Posts: 10; Joined: Tue Jun 20, 2006 8:52 am; Location: india

by manred » Tue Jul 24, 2007 8:22 pm

The answer is A.

Fn(9) = 3*9 = 27, since 9 is odd
Fn(6) = (1/2)*6 = 3, since 6 is even

Fn(9)*Fn(6) = 27*3 = 81

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beny: Master | Next Rank: 500 Posts; Posts: 214; Joined: Fri Jul 20, 2007 1:35 am; Thanked: 3 times

by beny » Tue Jul 24, 2007 8:46 pm

I got this question when I was prepping for GMAT also. I was positive the answer was A (81), but GMAT prep said the answer was D (27). No explanation to the answer, thanks GMATPrep!

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