Join

CAT WhatsApp Group

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 .

Get 3 Free CAT Mock Tests with Expert Video Solutions Get 3 Free CAT Mock Tests

Get AI Help

View More Questions From Probability, Combinatorics

Create a FREE account and get:

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

maruti sir image

CAT Quant Questions | CAT Quantitative Ability

CAT Time, Speed and Distance Questions CAT Averages Mixtures Alligations Questions CAT Venn Diagrams Questions CAT Number Systems Questions CAT Linear Equations Questions

CAT DILR Questions | LRDI Questions For CAT

CAT Maxima-Minima Questions CAT Data change over a period Questions CAT Table based DI Sets Questions CAT Scheduling Questions CAT Quant Based DI Questions

CAT Verbal Ability Questions | VARC Questions For CAT

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

Join CAT 2026 course by 5-Time CAT 100%iler

Crack CAT 2026 & Other Exams with Cracku!

Enroll Now

cracku download image

Ask our AI anything

AI can make mistakes. Please verify important information.