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What is the Next number in this sequence

Forums: Science And Math
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gjf
 
Reply Wed 16 Jun, 2004 09:33 pm
I came across this number sequence problem in the theatre play "Proof" by David Auburn and wondering if it can be solved.

-3, -6, 12, 9, -18, -21, ?

Thanks
Gary
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Type: Discussion • Score: 1 • Views: 575 • Replies: 3
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Asherman
 
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Reply Wed 16 Jun, 2004 11:27 pm
... 22
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lab rat
 
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Reply Thu 17 Jun, 2004 06:13 am
Pattern is alternating subtracting 3 and then multiplying by negative 2:
-3 - 3 = -6
-6 * -2 = 12
12 - 3 = 9
9 * -2 = -18
-18 - 3 = -21

So, the next number is -21 * -2 = 42
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gjf
 
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Reply Thu 17 Jun, 2004 07:03 pm
Thanks Lab Rat
It seems so easy now you have explained it.
The answer given in the show was -9 looks like they got it wrong.
Cheers
Gary
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