20. 16 without repeating a digit.
Using two positive integers to add up to 10:1 + 92 + 83 + 74 + 65 + 56 + 47 + 38 + 29 + 1
If repeats are permitted: 2 x 5 x 5 = 50 different odd numbers If repeats are not permitted: 2 x 4 x 3 = 24 different odd numbers
Yuo can make only one combination of 30 digits using 30 digits.
Integers are the whole numbers. Indian and Chinese mathematician were the first to contribute in the concept of using integers.
1 and 8 or 1, 1, 1, 2 and 4 or 1, 1, 1, 2, 2 and 2. And those are using only positive integers.
Fifty
125
We don't generally consider the negative factors of positive numbers, but they are exactly the same digits as the positive factors, just with minus signs.
No NEETs are counted using positive integers.No NEETs are counted using positive integers.No NEETs are counted using positive integers.No NEETs are counted using positive integers.
1-digit number: 5 possibilities 2-digits number: 5 x 5 = 25 possibilities So there are 30 numbers.
Using two positive integers to add up to 10:1 + 92 + 83 + 74 + 65 + 56 + 47 + 38 + 29 + 1
integers are used in skateboarding by using positive integers like 180 360 540 720 and 900
The set of natural numbers (counting numbers) {1,2,3,4....} corresponds to the positive integers. Note that the number 0 is neither positive nor negative. So anytime you want to count something you use natural numbers, which means you are also using positive integers.
If a digit can be repeated there are 5 x 5 x 5 = 125 possible numbers If a digit cannot be repeated there are 5 x 4 x 3 = 60 possible numbers.
If repeats are permitted: 2 x 5 x 5 = 50 different odd numbers If repeats are not permitted: 2 x 4 x 3 = 24 different odd numbers
Standard Form
Using only positive digits, and disregarding their order, 3 ways.