Aptitude - Numbers - Discussion

Discussion Forum : Numbers - General Questions (Q.No. 121)

Numbers

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 4 of 4.

Jamir said: 8 years ago

Thanks a lot @Jyothi.

Gokul said: 8 years ago

How 6^59 is only 6?

Sonu kumar said: 6 years ago

Nice, thanks all.

Hrushi said: 8 years ago

Thanks @Jyothi.

Mons said: 5 years ago

Thanks @Jyothi.

Mat said: 8 years ago

Thanks @Jyothi.

Anonymous said: 4 years ago

Thanks @Jyothi.

Prateek said: 9 years ago

Thanks, @Jyoti.

Unz said: 1 decade ago

How 6^59=6?

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