set 28 Q 11

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radhika1306: Master | Next Rank: 500 Posts; Posts: 144; Joined: Fri Apr 13, 2007 2:25 am

by radhika1306 » Mon Sep 17, 2007 6:47 pm

The product of the units digit, the tens digit, and the hundreds digit of the positive integer m is 96.
What is the units digit of m?
(1) m is odd.
(2) The hundreds digit of m is 8.

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Source: Beat The GMAT — Data Sufficiency | Mon Sep 17, 2007 6:47 pm

Gabby1: Newbie | Next Rank: 10 Posts; Posts: 4; Joined: Mon Sep 17, 2007 6:43 pm

by Gabby1 » Mon Sep 17, 2007 6:58 pm

Is the answer A?

Because 96 = 32*3 and the only way for M to be odd, is when the unit digit is 3. (the unit digit of M cannot be 1 in this case because 96 cannot be a product of 2 unit integers--the higest product of two unit integers is 81 = 9*9)

Information in (2) is sufficient because even if the hundredth digit is 8, it could be 834 or 843, we still don't know the unit digit.

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kajcha: Master | Next Rank: 500 Posts; Posts: 321; Joined: Tue Aug 28, 2007 5:42 am; Thanked: 1 times

by kajcha » Mon Sep 17, 2007 7:00 pm

Refer https://www.beatthegmat.com/viewtopic.php?t=5294

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