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forum.virtualchallengemeets.com • View topic - 2012 Regional Test Question

2012 Regional Test Question

Eighty problems in ten minutes. What's so hard about that?

2012 Regional Test Question

Postby NS10 » Mon May 13, 2013 10:56 am

Ok, so I had a few questions on this test that I'd like some help with.
(60) 21x43x65x87=_____________ answer: 4,851,142--5,361,788
(70) (8!/6!)(7!/5!)(6!/4!)=_________________ answer: 67,032--74,088
(79) 2,6,15,28,55,k,119,... k= __________ answer: 78

Obviously, the first two are estimation problems, I would just like some way to work them a little bit faster. And on 79 I have no idea what type sequence this is, can anyone help me out? Thanks!
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Re: 2012 Regional Test Question

Postby darksaber21 » Mon May 13, 2013 4:37 pm

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]

[unparseable or potentially dangerous latex formula]
Now I know the stakes, and I'm willing to show what I gots. I will see you all at state for the first and final time, so let's end the year with a bang! :)
MTHS - Class 5A, District VII, Region I
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Re: 2012 Regional Test Question

Postby nsguy1350 » Mon May 13, 2013 6:13 pm

70. [unparseable or potentially dangerous latex formula] [unparseable or potentially dangerous latex formula]

79. The sequence is the nth prime times n. 2 x 1 = 2, 3 x 2 = 6, 5 x 3 = 15, 7 x 4 =28, etc. Pretty crazy, I know.
2013 District 1/Region:
NS - 319/355
MA - 340/332
CA - 294/287
SC - 344/292
CS - 212/124 (fail)
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