GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
The number of prime numbers between 10 and 20
[#permalink]
24 Jun 2019, 11:18
24 Jun 2019, 11:18
Expert Reply
00:00
Question Stats:
96% (00:30) correct
3% (00:18) wrong based on 84 sessions
Hide Show timer Statistics
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.
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: The number of prime numbers between 10 and 20
[#permalink]
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
[#permalink]
17 Sep 2019, 10:19
17 Sep 2019, 10:19
1
1
Bookmarks
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.
Attachments
PrimeNumbersHundredsChart_1.jpg [ 101.93 KiB | Viewed 7442 times ]
