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Except for the first two numbers, every number in the set of 90 number

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Except for the first two numbers, every number in the set of 90 number [#permalink] New post   07 Apr 2025, 09:29
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Except for the first two numbers, every number in the set of 90 numbers $\(\{-1,3,2, \ldots \ldots\}\)$ is the sum of two preceding numbers. How many numbers of this set are even?


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Re: Except for the first two numbers, every number in the set of 90 number [#permalink] New post   11 Apr 2025, 04:30
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In the given set of numbers $\(\{-1,3,2,5,7,12,19,31,50,81,131,212 \ldots\}\)$, every third term is even. Therefore, 30 terms out of a total of 90 terms are even.
Thus, the correct answer is 30 .
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Re: Except for the first two numbers, every number in the set of 90 number [#permalink]
11 Apr 2025, 04:30
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