What is the sum of the first 39 positive odd numbers?

Answers

Answer 1

Answer: 1-39 ODD:
1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39
Now you'd add them all up.
1+3+5+7+9 = 25
11+13+15+17+19 = 75
21+23+25+27+29 = 125
31+33+35+37+39 = 175
Add the totals:
25+75+125+175
The answer would be 400.

Answer 2

Answer:

Final answer:

The sum of the first 39 positive odd numbers is 1521.

Explanation:

To find the sum of the first 39 positive odd numbers, we can use the formula for the sum of an arithmetic series. The formula is: S = (n/2)(a + l), where S is the sum, n is the number of terms, a is the first term, and l is the last term. In this case, n = 39, a = 1, and l = 77. Plugging these values into the formula, we get:

S = (39/2)(1 + 77)
S = (39/2)(78)
S = 39 * 39
S = 1521

Therefore, the sum of the first 39 positive odd numbers is 1521.

Learn more about Sum of odd numbers here:

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