Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 121)
121.
What is the unit digit in the product (365 x 659 x 771)?
Answer: Option
Explanation:
Unit digit in 34 = 1 
Unit digit in (34)16 = 1
Unit digit in 365 = Unit digit in [ (34)16 x 3 ] = (1 x 3) = 3
Unit digit in 659 = 6
Unit digit in 74 Unit digit in (74)17 is 1.
Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3
Required digit = Unit digit in (3 x 6 x 3) = 4.
Discussion:
39 comments Page 2 of 4.
Jignesh said:
9 years ago
@Jyothi.
Thanks for your clear explanation.
Thanks for your clear explanation.
Sachin kumar said:
9 years ago
E.g. 3^200 * 4^500?
Solution :-
3^200 * 4^500.
200/4 = 50, remainder is 0 , 3^4.
500/4 = 125, remainder is 0, 4^4.
= 3^4 * 4^4.
= 81 * 256.
= 1 * 6.
= 6 is the answer.
Solution :-
3^200 * 4^500.
200/4 = 50, remainder is 0 , 3^4.
500/4 = 125, remainder is 0, 4^4.
= 3^4 * 4^4.
= 81 * 256.
= 1 * 6.
= 6 is the answer.
Soujanya S said:
9 years ago
@Jyothi.
Thanks for explaining it in easy way.
Thanks for explaining it in easy way.
Gayathri said:
9 years ago
Thanks, @Jyothi. It's an easy way.
Prateek said:
9 years ago
Thanks, @Jyoti.
Jenifer said:
9 years ago
Thanks you so much @Jyoti.
Priya said:
9 years ago
I can't understand it. Please anyone explain me clearly.
Jamir said:
8 years ago
Thanks a lot @Jyothi.
Prem said:
8 years ago
Thanks for your clear explanation @Jyothi.
Mat said:
8 years ago
Thanks @Jyothi.
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