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:
125 comments Page 4 of 13.
Ahankar said:
8 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).
Himanshi said:
8 years ago
Consider this:
For,x=Odd, the unit place for 4^x is 4. The unit place for 5^x is 5, The unit place for 1^x is 1.
and x=Even, the unit place for 4^x is 6. The unit place for 5^x is 0, The unit place for 1^x is 1.
=>unit place means the digit present at the one's place(rightmost digit) of a number.
For,x=Odd, the unit place for 4^x is 4. The unit place for 5^x is 5, The unit place for 1^x is 1.
and x=Even, the unit place for 4^x is 6. The unit place for 5^x is 0, The unit place for 1^x is 1.
=>unit place means the digit present at the one's place(rightmost digit) of a number.
Sabu said:
8 years ago
Understand the answer, Thank you, @Seema.
Harshal said:
9 years ago
In simpler manner for 4^x.
For,x=Odd unit place is 4.
and x=Even unit place is 6.
For,x=Odd unit place is 4.
and x=Even unit place is 6.
Raj said:
9 years ago
Thanks @Jhansi.
Teju said:
9 years ago
Thanks @Sowjanya.
Sowjanya said:
9 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.
Hemant said:
10 years ago
How - (5)^317 = 5?
I solved - (5^2)^158 * 5 it gives unit digit 0.
I solved - (5^2)^158 * 5 it gives unit digit 0.
Reshma said:
10 years ago
Thank you @Nidhin M Z.
Apurva Raj said:
10 years ago
Anybody can find the remainder of this question (5^625) /7?
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers