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.
A code is created by choosing 2 one digit numbers followed b
[#permalink]
28 Aug 2020, 10:26
28 Aug 2020, 10:26
Expert Reply
00:00
Question Stats:
65% (00:38) correct
34% (00:28) wrong based on 32 sessions
Hide Show timer Statistics
A code is created by choosing 2 one digit numbers followed by 2 letters from the 26 letters of the alphabet. Repetition of numbers is allowed, but repetition of letters is not. How many different possible codes can be formed in this way?
A. 2,340
B. 5,850
C. 6,500
D. 65,000
E. 67,600
A. 2,340
B. 5,850
C. 6,500
D. 65,000
E. 67,600
Re: A code is created by choosing 2 one digit numbers followed b
[#permalink]
28 Aug 2020, 10:26
28 Aug 2020, 10:26
Expert Reply
Post A Detailed Correct Solution For The Above Questions And Get A Kudos.
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
For more theory and practice see our GRE - Math Book
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
For more theory and practice see our GRE - Math Book
Re: A code is created by choosing 2 one digit numbers followed b
[#permalink]
28 Aug 2020, 11:47
28 Aug 2020, 11:47
1
The number of possible options in combinatorics is number o options1* number of options2 * ... * number of optionsN
We have 2 digits - we have 10 options from 0 to 9
So the number of options for digits is 100 or 10*10 - you may check it from 00 01 ... 10 to 99
we have 26 possible digits for the third place and only 25 digits for the forth - as there is no replacement.
The total number is 10*10*26*25 = 65000
We have 2 digits - we have 10 options from 0 to 9
So the number of options for digits is 100 or 10*10 - you may check it from 00 01 ... 10 to 99
we have 26 possible digits for the third place and only 25 digits for the forth - as there is no replacement.
The total number is 10*10*26*25 = 65000
