As long as more than one mathematical operator is allowed then 50 can be formed in several ways from the first ten odd numbers - i.e. those from 1 to 19.
(7 x 17) - 13 - 9 - 5 = 77 - 27 = 50.
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The average is 10. You will find that the average when adding together the first n odd numbers is always equal to n.
The first 10 positive odd numbers are 1, 3, 5, 7, 11, 13, 17, 19, 23, and 29.
152
No. For example, 5+5=10.
101