Question

How many four digit odd number are there ? (Repetition of digits is not allowed)​

Answer 1

Answer:

How many four-digit odd numbers do not use any digit more than once? The answer is C, 2240.

Answer 2

Answer:

2268

Step-by-step explanation:

Let a 4-digit number be represented by ABCD .

Conditions:

A can have any value between 1 to 9 - so total 9  possibilities

B can have any value between 0 to 9, but not that of A - so total 9

C can have any value between 0 to 9, but not that of A or B - so total 8

D can have any value between 0 to 9, but not that of A, B or C - so total 7

All possible 4-digit numbers (without repeating any digit) = 9*9*8*7 = 4536 .

Since half of these numbers will be odd, therefore, no. of possible odd 4-digit numbers (without repeating any digit) = 4536 / 2 = 2268

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