Do you see that ' 7 ' on the end of 127 ? That ' 7 ' is odd, so the entire number is odd. It doesn't matter how many other numbers come before the ' 7 ' or what they are.
The odd one out is 127 because it is the only prime number in the sequence. The rest of the numbers are all multiples of 10 with a difference of 10 between each consecutive number.
121 123 125 127
There are 20 odd numbers between 19 and 57
The parity rules are: Odd + Odd = Even Even + Even = Even Odd + Even = Odd Even + Odd = Odd So the parity where one number is even is that of the other number. This means that you can go through a list of numbers and ignore all the even numbers. Every PAIR of odd numbers has even parity and by the previous paragraph, even parity can be ignored. So you can pair off odd numbers and ignore them.
Do you see that ' 7 ' on the end of 127 ? That ' 7 ' is odd, so the entire number is odd. It doesn't matter how many other numbers come before the ' 7 ' or what they are.
The odd one out is 127 because it is the only prime number in the sequence. The rest of the numbers are all multiples of 10 with a difference of 10 between each consecutive number.
121 123 125 127
Between the two numbers there are 49.
The odd numbers between 40 and 53 are 41,43,45,47,49,51.
There are 44 odd numbers between the two.
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
There are 1499 odd numbers between 2000 and 4999
There are 69 odd numbers between 20 and 158.
There are 20 odd numbers between 19 and 57
50 and 52 are the even numbers in this range, the odd numbers will be all the others, which is just the number 51.
how many odd numbers is there between 20 and 158