9 multiplied by any other odd number will still be odd. 9 multiplied by any even number will be even - so the multiples of 9 between 1 and 120 that are odd would be:
1x9 = 9
3x9 = 27
5x9 = 45
7x9 = 63
9x9 = 81
11x9 = 99
13x9 =117
The next odd number you could multiply 9 by is 15 but 15x9 = 135, which is greater than 120 so does not fall within the constraints of the question.
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An infinite number. There are an infinite number of odd numbers and the multiple of nine with each one of them is odd. So there are an infinite number of odd multiples of 9.
Numbers that are prime can't be multiples of 10. Multiples of 10 can't be odd.
NO. When a number is odd, not all of its multiples are odd.Example: 3 is an odd number.Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24,...Multiples of 3 which are not odd: 6, 12, 18, 24, ...
In that range... 2, 3, 5, 7, 11 are prime. 1, 3, 5, 7, 9, 11 are odd. 1, 4, 9 are square. 3, 6, 9, 12 are multiples of 3. 0, 2, 4, 6, 8, 10, 12 are even.
There are infinitely many multiples of 9 and 21 so it is impossible to list them. One of their multiples is 9*21 = 189.
There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.