Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 128)
128.
What is the unit digit in 7105 ?
Answer: Option
Explanation:
Unit digit in 7105 = Unit digit in [ (74)26 x 7 ]
But, unit digit in (74)26 = 1
Unit digit in 7105 = (1 x 7) = 7
Discussion:
17 comments Page 2 of 2.
Rinky said:
1 decade ago
If we take nth power of a no having unit digit 1 then a no is obtained having unit digit 1. As unit digit of 7 power 4 is 1 so 26th power of a number having unit digit 1 is 1. i.e. (7^4)^26=a no having unit digit 1.
Keerthi said:
1 decade ago
Unit digit means which is in units place.
Bhagyasri said:
1 decade ago
How to know that unit digit of 7 power 4 whole to the power 26 is 1?
Sravanthi said:
1 decade ago
What is unit digit?
Roja said:
2 decades ago
if we calculate 7 power 4, we will get unit digit is 1. so 1(unit digit) power anything is there, we will get 1 in unit digit
Aswath said:
2 decades ago
same doubt as akshatha hav!!!
Akshatha said:
2 decades ago
please tell me how to know that unit digit in 7 power 4 whole power 26 is 1..?
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