CAT 2020 Number System Question (Medium)

Question

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

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

Quantitative

Number System

Medium

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

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