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When you add the odd numbers from 1 to 20 total sum of 100 . How you make the two groups of odd numbers so the total comes to 50?
There have to be an even number of odd numbers in each group, and each group must have more than two odd numbers (since 19 + 17 is only 36); thus there must be four in one group and six in the other. There are many ways to get four odd numbers to add up to to 50; for example, you could take 1, 13, 17 and 19. The remaining six odd numbers will then also add up to 50.
How many numbers in 1-25 odd?
26
What 7 odd numbers that will total 30?
You cannot do this, because you're taking odd numbers: if you add two odd numbers together, you will get an even number. Take the odd numbers in pairs, so you'll have 3 pairs plus an extra odd number. The 3 pairs make 3 even numbers. You can add up any number of even numbers and get an even number, so you will have an even + odd, which is odd. 30 is an even number, but your result will be odd, no matter what 7 odd numbers you choose.
What is the 7th odd number?
Honey, the 7th odd number is 13. You start with 1, then add 2 to get 3, add 2 again to get 5, add 2 more to get 7, add 2 more to get 9, add 2 more to get 11, and finally add 2 more to get 13. It's like counting on your fingers, but with a little extra math sass.
If the sum of two numbers is even then the two numbers must be even?
If the sum of two numbers is even, the two numbers are either both even or both odd. A few examples:2 + 4 = 6 (even + even = even)2 + 3 = 5 (even + odd = odd)5 + 2 = 7 (odd + even = odd)7+13 = 20 (odd + odd = even)
