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The number of prime numbers between 10 and 20
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24 Jun 2019, 11:18
24 Jun 2019, 11:18
Expert Reply
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Question Stats:
96% (00:30) correct
3% (00:18) wrong based on 84 sessions
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Quantity A |
Quantity B |
The number of prime numbers between 10 and 20 |
The number of prime numbers between 30 and 40 |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
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Re: The number of prime numbers between 10 and 20
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25 Jun 2019, 05:14
25 Jun 2019, 05:14
Carcass wrote:
Quantity A |
Quantity B |
The number of prime numbers between 10 and 20 |
The number of prime numbers between 30 and 40 |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Some primes: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41,....
There are 4 primes (11, 13, 17, and 19) between 10 and 20
There are 2 primes (31, 37) between 30 and 40
We get:
QUANTITY A: 4
QUANTITY B: 2
Answer: A
Cheers,
Brent
Re: The number of prime numbers between 10 and 20
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17 Sep 2019, 10:19
17 Sep 2019, 10:19
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If one can remember 44 223 223 21
Then you know the number of primes for each row of numbers, for the 1's through all the tens.
Then you know the number of primes for each row of numbers, for the 1's through all the tens.
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