Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 10)
10.
What is the unit digit in {(6374)1793 x (625)317 x (341491)}?
Answer: Option
Explanation:
Unit digit in (6374)1793 = Unit digit in (4)1793
= Unit digit in [(42)896 x 4]
= Unit digit in (6 x 4) = 4
Unit digit in (625)317 = Unit digit in (5)317 = 5
Unit digit in (341)491 = Unit digit in (1)491 = 1
Required digit = Unit digit in (4 x 5 x 1) = 0.
Discussion:
123 comments Page 7 of 13.
Jeevitha said:
1 decade ago
Given question is.
{(6374)^1793 x (625)^317 x (341)^491}.
Ans:
NOTE: Unit digit for (4)^odd num is 4.
Unit digit for (4)^even num is 6.
Unit digit for (5)^any num is 5.
Unit digit for (1)^any num is 1.
Now apply the above conditions,
Unit digit of 6374 is 4.
Unit digit of 625 is 5.
Unit digit of 341 is 1.
Just multiply 4*5*1 = 20.
So unit digit of 20 is 0.
Answer is 0.
{(6374)^1793 x (625)^317 x (341)^491}.
Ans:
NOTE: Unit digit for (4)^odd num is 4.
Unit digit for (4)^even num is 6.
Unit digit for (5)^any num is 5.
Unit digit for (1)^any num is 1.
Now apply the above conditions,
Unit digit of 6374 is 4.
Unit digit of 625 is 5.
Unit digit of 341 is 1.
Just multiply 4*5*1 = 20.
So unit digit of 20 is 0.
Answer is 0.
Shubham said:
1 decade ago
Hi I have few questions.
1) In the above problem we have taken the unit digits of every number regardless of of the power.
2) If any such type questions come can we use the same method to solve the problem. Please answer.
1) In the above problem we have taken the unit digits of every number regardless of of the power.
2) If any such type questions come can we use the same method to solve the problem. Please answer.
Praveen said:
1 decade ago
Power are not equals then what we do.
Suryasish said:
1 decade ago
@Abhigyan reddy.
The units digit can be 1, 3, 7 or 9.
The units digit can be 1, 3, 7 or 9.
Neeha said:
1 decade ago
Please explain in briefly.
Abhignareddy said:
1 decade ago
(2467)^153*(341)^72 solve this please.
Vidhya said:
1 decade ago
How to find easy way to answer the question?
Susmitha said:
1 decade ago
What is the unit digit of {3^65*6^59*7^71}? Please can anyone explain me the answer?
Shivani said:
1 decade ago
Thanks @Seema. I got your point otherwise all of them make me confuse.
HIDD said:
1 decade ago
When power is same we can just multiple the unit number, we will get answer.
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