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Units digit of the product of the first 7 positive integers
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27 Jan 2021, 05:14
27 Jan 2021, 05:14
Expert Reply
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Question Stats:
96% (00:46) correct
3% (01:02) wrong based on 26 sessions
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Quantity A |
Quantity B |
Units digit of the product of the first 7 positive integers |
Units digit of the product 8 to 14, inclusive |
A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
Kudos for the right answer and explanation
Re: Units digit of the product of the first 7 positive integers
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27 Jan 2021, 08:25
27 Jan 2021, 08:25
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Qt A
product of first 7 positive integers.
It includes 1-7. Now it contains 2 & 5 hence the unit digit will be 0
Qt B
product of nos between 8-14
It includes 10 so unit digit will be 0
Answer C
product of first 7 positive integers.
It includes 1-7. Now it contains 2 & 5 hence the unit digit will be 0
Qt B
product of nos between 8-14
It includes 10 so unit digit will be 0
Answer C
General Discussion
Senior Manager
Joined: 23 Jan 2021
Posts: 294
Given Kudos: 81
Concentration: , International Business
Re: Units digit of the product of the first 7 positive integers
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29 May 2021, 18:29
29 May 2021, 18:29
rx10 wrote:
Qt A
product of first 7 positive integers.
It includes 1-7. Now it contains 2 & 5 hence the unit digit will be 0
Qt B
product of nos between 8-14
It includes 10 so unit digit will be 0
Answer C
product of first 7 positive integers.
It includes 1-7. Now it contains 2 & 5 hence the unit digit will be 0
Qt B
product of nos between 8-14
It includes 10 so unit digit will be 0
Answer C
Good solution, Indeed. I did with another approach, took me long time and still got answer wrong
