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.
5, 8, 3, 7 How many different numbers k are there such that
[#permalink]
06 Dec 2019, 02:39
06 Dec 2019, 02:39
1
Expert Reply
00:00
Question Stats:
58% (01:22) correct
41% (01:27) wrong based on 17 sessions
Hide Show timer Statistics
\(5, 8, 3, 7 \)
How many different numbers k are there such that the sum of k and 3 of the 4 numbers shown equals 24?
A. 4
B. 5
C. 6
D. 8
E. Infinitely many
Kudos for the right answer and explanation
How many different numbers k are there such that the sum of k and 3 of the 4 numbers shown equals 24?
A. 4
B. 5
C. 6
D. 8
E. Infinitely many
Kudos for the right answer and explanation
Re: 5, 8, 3, 7 How many different numbers k are there such that
[#permalink]
09 Dec 2019, 10:04
09 Dec 2019, 10:04
2
If we add up the four digits we will acquire 23
5+8+3+7 = 23
Since the sum is less than 24
the answer is as easy as choosing 3 digits out of 4 total digits considering the fact that their sequence is not important;
It means the answer in nCr type will be 4C3( choice of 3 out of 4) = 4
for that 4 kinds of 3 digits number, we will have one specific K
5+8+3+k = 24 ----> K = 8
5+8+7+k = 24 ----> K = 4
5+3+7+k = 24 ----> K = 5
8+3+7+k = 24 ----> K = 6
5+8+3+7 = 23
Since the sum is less than 24
the answer is as easy as choosing 3 digits out of 4 total digits considering the fact that their sequence is not important;
It means the answer in nCr type will be 4C3( choice of 3 out of 4) = 4
for that 4 kinds of 3 digits number, we will have one specific K
5+8+3+k = 24 ----> K = 8
5+8+7+k = 24 ----> K = 4
5+3+7+k = 24 ----> K = 5
8+3+7+k = 24 ----> K = 6
5, 8, 3, 7 How many different numbers k are there such that
[#permalink]
09 Oct 2024, 11:13
09 Oct 2024, 11:13
Carcass wrote:
\(5, 8, 3, 7 \)
How many different numbers k are there such that the sum of k and 3 of the 4 numbers shown equals 24?
A. 4
B. 5
C. 6
D. 8
E. Infinitely many
Kudos for the right answer and explanation
How many different numbers k are there such that the sum of k and 3 of the 4 numbers shown equals 24?
A. 4
B. 5
C. 6
D. 8
E. Infinitely many
Kudos for the right answer and explanation
But it's not mentioned that K must be an integer here? and if it explicitly doesn't mention k being an integer then there could be infinitely many values right?
