CAT 2020 Number System Question (Medium)

Question

The mean of all 4 digit even natural numbers of the form aabb , where a 0, is

Optima Learn · Accepted Answer

Step 1 Understand the form aabb We are looking at 4-digit even numbers of the form aabb ranges from 1 to 9 since ranges from 0 to 9 The number is even last digit must be even So total possible values 9 choices 5 choices Total such numbers --- Step 2 Represent number aabb in terms of a and b 1000a 10

CAT 2020 Number System — Previous Year Question

CAT 2020

Quantitative

Number System

Medium

Master Your PI Skills for Top B-Schools!

Practice

Features

Support