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Re: An infinite sequence of positive integers is called a "beta [#permalink]
Bunuel wrote:
manishuol wrote:
An infinite sequence of positive integers is called a "beta Sequence" if the number of odd integers in the sequence is finite. If S is an infinite sequence of positive integers, is S a beta sequence?


(1) The first ten integers in S are even.
(2) The difference between each successive pair of terms in S is a constant


Similar question to practice:
Quote:
An infinite sequence of positive integers is called an "alpha sequence" if the number of even integers in the sequence is finite. If S is an infinite sequence of positive integers, is S an alpha sequence?

(1) The first ten integers in S are even.
(2) An infinite number of integers in S are odd.


Discussed here: an-infinite-sequence-of-positive-integers-is-called-an-101758.html

Hope it helps.


Thanks !! Bunuel .........
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Re: An infinite sequence of positive integers is called a "beta [#permalink]
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Given : Beta Sequence = Finite Odd Integers + Infinite Even Integers

From
1) First 10 integers are even - No info about Odd integers ( 1 alone is not enough)
2) Difference between successive pairs is constant => Sequence is in Arithmetic Progression, so it can be a sequence of all Even integers or all Odd integers. (2 alone is not enough)

Combining 1 and 2 we can deduce the sequence to be a Infinite Even Integer Sequence, hence C
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An infinite sequence of positive integers is called a "beta [#permalink]
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manishuol wrote:
An infinite sequence of positive integers is called a "beta Sequence" if the number of odd integers in the sequence is finite. If S is an infinite sequence of positive integers, is S a beta sequence?


(1) The first ten integers in S are even.
(2) The difference between each successive pair of terms in S is a constant


Is S a beta sequence? Or in other words, does S have a finite number of odd integers? This is a Yes or No question.

1) The first statement tells us that the first ten integers in S are even but gives no info about the rest of the terms. Statement 1 is not sufficient, we can eliminate answer choices A and D.

2) The second statement tells us that the difference between each two successive terms is a constant, therefore we know that S is an arithmetic progression but we have no information about the terms composing the sequence. Statement 2 is not sufficient. We can eliminate answer choice B and we are left with answer choices C and E.

1)+2) Now combining both statements together, we know that the constant in the arithmetic progression is an even number and because adding an even number to an even number will always yield to an even number; this sequence is composed of only even positive integers. Hence there are 0 odd terms on this sequence, which consequently has a finite number of odd integers. Both statements together are sufficient.

Correct answer is C.


Bunuel KarishmaB chetan2u can you please check the answer above and share an official answer to this question?
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Re: An infinite sequence of positive integers is called a "beta [#permalink]
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HoudaSR wrote:
manishuol wrote:
An infinite sequence of positive integers is called a "beta Sequence" if the number of odd integers in the sequence is finite. If S is an infinite sequence of positive integers, is S a beta sequence?


(1) The first ten integers in S are even.
(2) The difference between each successive pair of terms in S is a constant


Is S a beta sequence? Or in other words, does S have a finite number of odd integers? This is a Yes or No question.

1) The first statement tells us that the first ten integers in S are even but gives no info about the rest of the terms. Statement 1 is not sufficient, we can eliminate answer choices A and D.

2) The second statement tells us that the difference between each two successive terms is a constant, therefore we know that S is an arithmetic progression but we have no information about the terms composing the sequence. Statement 2 is not sufficient. We can eliminate answer choice B and we are left with answer choices C and E.

1)+2) Now combining both statements together, we know that the constant in the arithmetic progression is an even number and because adding an even number to an even number will always yield to an even number; this sequence is composed of only even positive integers. Hence there are 0 odd terms on this sequence, which consequently has a finite number of odd integers. Both statements together are sufficient.

Correct answer is C.


Bunuel KarishmaB chetan2u can you please check the answer above and share an official answer to this question?


I do not know the source of the question and do not have the official solution, but your solution is correct.
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Re: An infinite sequence of positive integers is called a "beta [#permalink]
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