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21.12.2019 •
Mathematics
How many pairs of whole numbers have sum of 110
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Ответ:
Solution: The are total 56 pairs of whole numbers whose sum is 110.
Explanation:
The whole numbers are all positive integers including 0.
If the sum is an even number n then the pairs of whole numbers are .
If the sum is an odd number n then the pairs of whole numbers are .
Since 110 is an even number therefore the pairs of whole number with sum 10 are
And the pairs are (0,110),(1,109),...,(55,55) after that the pairs are repeated so we can't consider those repeated pairs.
For example we have to find the pairs of whole numbers have sum of 6. So the pairs are (0,6),(1,5),(2,4),(3,3) and from the formula the number of pairs is .
Hence, the are total 56 pairs of whole numbers whose sum is 110.
Ответ:
(C)
Step-by-step explanation:
the average is 9 more