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18 Jan 2022, 11:00
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What are the exact numbers?
-5,-4,-3,-2,-1,0,1/2,1,2
How many numbers are exact numbers in the above sequence and why?
And why others are not?
-5,-4,-3,-2,-1,0,1/2,1,2
How many numbers are exact numbers in the above sequence and why?
And why others are not?
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24 Jan 2022, 06:57
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NXJ000
Hi NXJ000!
An exact number is "a value that is known with complete certainty".
This means that all of the numbers in the sequence you've given are exact numbers because we know their value exactly and none of them have been rounded or truncated.
We could say that pi is 3.14, but that wouldn't be its exact value because we've rounded it to two decimal places. Anything that is rounded or truncated is not an exact number because you're no longer using the exact value of that number.
24 Jan 2022, 07:09
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This question is from GMAT online official prep
-5,-4,-3,-2,-1,0,1,2
As per the answer sheet, this sequence has only 2 exact number (Answer doesn't explain what are those and why )
My understanding of the exact number is the same as you mentioned but it doesn't match what the GMAT prep question says.
I am unable to attach a screenshot but this os what it has
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Q : In a certain sequence of 8 numbers, each number after the first is 1 more than the previous number. If the first number is –5, how many of the numbers in the sequence are exact?
Solution: The correct answer is C.
The sequence consists of eight consecutive integers beginning with −5:
−5, −4, −3, −2, −1, 0, 1, 2
In this sequence exactly two of the numbers are exact.
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-5,-4,-3,-2,-1,0,1,2
As per the answer sheet, this sequence has only 2 exact number (Answer doesn't explain what are those and why )
My understanding of the exact number is the same as you mentioned but it doesn't match what the GMAT prep question says.
I am unable to attach a screenshot but this os what it has
---------------------
Q : In a certain sequence of 8 numbers, each number after the first is 1 more than the previous number. If the first number is –5, how many of the numbers in the sequence are exact?
Solution: The correct answer is C.
The sequence consists of eight consecutive integers beginning with −5:
−5, −4, −3, −2, −1, 0, 1, 2
In this sequence exactly two of the numbers are exact.
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