Quantitative Aptitude – Modern Maths – P and C – How many two-digit numbers

Quantitative Aptitude – Number System – How many two-digit numbers

Slot -2 – Quantitative Aptitude – Modern Maths – P & C – How many two-digit numbers

 How many two-digit numbers, with a non-zero digit in the units place, are there which are more than thrice the number formed by interchanging the positions of its digits?

a) 6
b) 8
c) 7
d) 5

Answer: 6

Let the number is ab so
10a+b >3(10b+a)
So the possible pair of (a,b) are (5,1), (6,1), (7,1) , (8,1) , (9,1) & (9,2)
Thus total 6 such numbers are possible.

Other posts related to Quantitative Aptitude – Modern Maths

Permutation and Combination – Fundamental Principle of Counting
Permutation and Combination – Distribution of Objects
How to find Rank of a Word in Dictionary (With or Without Repetition)
Set Theory- Maximum and Minimum Values
How to solve questions based on At least n in Set Theory for CAT Exam?
Sequence and Series Problems and Concepts for CAT 2018 Exam Preparation
Basic Probability Concepts for CAT Preparation

Online Coaching Course for CAT 2021 + Test Series

a) 1000+ Videos covering entire CAT syllabus
b) 2 Live Classes (online) every week for doubt clarification
c) Study Material & PDFs for practice and understanding
d) 10 Mock Tests in the latest pattern
e) Previous Year Questions solved on video