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Permutations — MATHS STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSPermutations2 Marks
Question
How many three-digit odd numbers are there?
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Answer

The three digit numbers are 100 to 999 inclusive so there are
999 - 100 + 1 = 999 - 99 = 900
So, 900 three digit numbers If half of all numbers is odd then half of 900 is 450, there are 450 odd positive 3 digit numbers.

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