Question 16

The rightmost non-zero digit of the number $$30^{2720}$$ is

Solution

Rightmost non-zero digit of $$30^{2720}$$ is same as rightmost non-zero digit of $$3^{272}$$.

272 is of the form 4k.

All $$3^{4k}$$ end in 1.

=> Right most non-zero digit is 1.

Share on Whatsapp Share on Whatsapp

Boost your CAT prep: Take All-India 3 free CAT mock tests with Video solutions

Video Solution

video

Click on the Email ☝️ to Watch the Video Solution

Create a FREE account and get:

All Quant CAT complete Formulas and shortcuts PDF
38+ CAT previous year papers with video solutions PDF
5000+ Topic-wise Previous year CAT Solved Questions for Free

CAT Quant Questions | CAT Quantitative Ability

CAT Probability, Combinatorics Questions CAT Quadratic Equations Questions CAT Algebra Questions CAT Functions, Graphs and Statistics Questions CAT Remainders Questions

CAT DILR Questions | LRDI Questions For CAT

CAT Charts Questions CAT Scheduling Questions CAT Data Interpretation Basics Questions CAT Table with Missing values Questions CAT Games and Tournamnents Questions

CAT Verbal Ability Questions | VARC Questions For CAT

CAT Para Summary Questions CAT Para Jumbles Questions CAT Grammar and Sentence Correction Questions CAT Verbal Ability Questions CAT Odd One Out Questions

Also Read

CAT Mock Tests

CAT 2025 Course

Free CAT Preparation

CAT Questions

CAT Formulas PDF

CAT Study Material

CAT Score vs Percentile

CAT Score Calculator

CAT Percentile Predictor

CAT Sectional Tests

CAT Exam

CAT Prep Videos

CAT Registration

CAT Syllabus 2025

CAT Eligibility Criteria

CAT Admit Card

Follow us on

Boost your Prep!

Download App