Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 128)

Numbers

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.

Bhagyasri said: 1 decade ago

How to know that unit digit of 7 power 4 whole to the power 26 is 1?

Pratyush said: 8 years ago

I too tried the same method @Shadab.

Is the method right or wrong, if yes then why? please explain it.

Prem kumar said: 8 years ago

What is the unit digit? How can we find?

Please explain with example.

Sravanthi said: 1 decade ago

What is unit digit?

Radhika Agrawal said: 8 years ago

Can we find it by using log?

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!!!

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