Except for the first two numbers, every number in the sequence –1, ... ...
Except for the first two numbers, every number in the sequence –1, 3, 2, . . . is the sum of the two immediately preceding numbers. How many numbers of this sequence are even?
(A) none
(B) ...
(C) ...
(D) ...
(E) ...
*This question is included in
Nova Math - Problem Set Y: Sequences & Series
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Except for the first two numbers, every number in the sequence –1, ... ...
Posted: 09/26/2014 15:32
How many numbers are we expected to project in problems like this? We could potentially waste a lot of time looking for numbers that may not exist.
Contributor
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Posted: 09/26/2014 16:41
Darren, not very many. From the answer choices in this problem, we know we are looking for at least 3 even numbers, and we can see that it repeats every 4th number.
In other cases, we can usually create a formula to do the computation.
The problem needs to be solved in 1-2 minutes.
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Except for the first two numbers, every number in the sequence –1, ... ...
Posted: 06/27/2015 15:19
Isn't the order( -1,3,2,5,7,12,19,21,40,61,101,162...
If we add immediately preceding number.
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Posted: 06/27/2015 22:30
Hi Munir,
12 + 19 = 31, not 21.
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