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 4 of 13.
Ahankar said:
7 years ago
Simply, We have to take last digit of every number so by taking last number as 4, 5, 1. Now multiply these 4*5*1=20 so now take last digit of answer so it is 0 (zero).
Hola said:
7 years ago
Simply, We have to take last digit of every number so by taking last number as 4, 5, 1. Now multiply these 4*5*1=20 so now take last digit of answer so it is 0 (zero).
Abc said:
1 decade ago
This can be done in a simpler manner.
The unit digit of 625^x is 5.
The unit digit of 6374^y is an even number.
When multiplied, the unit digit must be 0.
How?
The unit digit of 625^x is 5.
The unit digit of 6374^y is an even number.
When multiplied, the unit digit must be 0.
How?
Channakeshava D S said:
4 years ago
A simple way to find unit digit.
6374 last number is 4.
625 last number is 5.
341 last number is 1.
So 4*5*1= 20.
20 last number is 0.
Hence the answer is 0.
6374 last number is 4.
625 last number is 5.
341 last number is 1.
So 4*5*1= 20.
20 last number is 0.
Hence the answer is 0.
(66)
Hemanth said:
1 decade ago
This can be done in a simpler manner.
The unit digit of 625^x is 5.
The unit digit of 6374^y is an even number.
When multiplied, the unit digit must be 0.
The unit digit of 625^x is 5.
The unit digit of 6374^y is an even number.
When multiplied, the unit digit must be 0.
Ramya said:
1 decade ago
Its so simple,
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.
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.
Sowjanya said:
8 years ago
There is simply way to get this answer.
{(6374)1793*(625)317*(314 )491)}.
Unit place is the last number.
4 * 5 * 1 = 20.
Last digit is 0.
{(6374)1793*(625)317*(314 )491)}.
Unit place is the last number.
4 * 5 * 1 = 20.
Last digit is 0.
Shubhi said:
1 decade ago
The unit digit is simply another term for the ones place..
the unit digit in 2343546 is 6
the unit digit in 234 is 4.. etc :)
the unit digit in 2343546 is 6
the unit digit in 234 is 4.. etc :)
Sasi said:
1 decade ago
When finally mutilpled (4*5*1) we get 20. Consider the 20, the last digit ill be the unit digit. So the answer is 0,
Got it.
Got it.
Saurabh said:
1 decade ago
If we have to find tens digit then how we find and the expression is same { (6374) ^1793 x (625) ^317 x (341^491) }?
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