Question

20 Using the digits 1. 4.6 and 8 each only once, how many four digit odd numbers can be fomedy

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Answer 1

The answer is 72.

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Answer 2

Given :

• 1,4,6,8 and each only once

To solve :

• Number with odd numbers of 4- digit formed.

Solution :

For a number to be odd its unit digit must be odd so out of these digits '1' always be at unit place .

$\sf\implies$ So ,numbers are :

$\sf\huge\implies$(1) 4681

$\sf\huge\implies$(2) 4861

$\sf\huge\implies$ (3) 6481

$\sf\huge\implies$ (4) 6841

$\sf\huge\implies$ (5) 8641

$\sf\huge\implies$ (6) 8461

Hence , total 6 odd numbers