Question 7

How many numbers greater than 0 and less than a million can be formed with the digits 0, 7 and 8?

Solution

According to given condiitons, number of 1 digit nos. = 2, number of 2 digit nos. = 2*3 , number of 3 digit nos. = $$2*3^2$$ , number of 4 digit nos. = $$2*3^3$$ , number of 5 digit numbers. = $$2*3^4$$, Number of 6 digit nos. = $$2 *3^5$$.

Total summation 2*(1+3+9+27+81+243) = 728 .

Gauge your prep level today: Take 3 free All-India CAT mock tests with Video solutions

Create a FREE account and get:

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

CAT Quant Questions | CAT Quantitative Ability

CAT Time Speed Distance Questions CAT Averages Questions CAT Time, Distance and Work Questions CAT Data Sufficiency Questions CAT Linear Equations Questions

CAT DILR Questions | LRDI Questions For CAT

CAT Puzzles Questions CAT Miscellaneous LR Questions CAT DI with connected data sets Questions CAT DI Miscellaneous Questions CAT Data change over a period Questions

CAT Verbal Ability Questions | VARC Questions For CAT

CAT Para Jumbles Questions CAT Para Summary Questions CAT Grammar and Sentence Correction Questions CAT Miscellaneous Questions CAT Critical Reasoning Questions

CAT 2002 QA Question

How many numbers greater than 0 and less than a million can be formed with the digits 0, 7 and 8?

CAT Quant Questions | CAT Quantitative Ability

CAT DILR Questions | LRDI Questions For CAT

CAT Verbal Ability Questions | VARC Questions For CAT

Free Quant Questions

Login to your Cracku account

Hello! 👋

Ready to Unlock Your Success?

Please Enter Your OTP

Please enter the following details

Create a free Cracku account