navyaseth620
30.11.2019 •
Mathematics
Which of the following represents the sum of the series below? the sum of the first 7 odd numbers the sum of the first 7 even numbers the sum of the 7 numbers beginning with 2 the sum of the 7 numbers beginning with 1
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Ответ:
The correct answer is A. The sum of the first 7 odd numbers
Step-by-step explanation:
1. Let's review the information provided to us for solving the sum of the series:
Sₙ = ∑ ⁷ k = 1, [ 1 + (k -1) (2)]
2. Let's resolve the sum of the series:
For k = 1, [ 1 + (1 -1) (2)] = [1 + 0 * 2] = [1 + 0] = 1
For k = 2, [ 1 + (2 -1) (2)] = [1 + 1 * 2] = [1 + 2] = 3
For k = 3, [ 1 + (3 -1) (2)] = [1 + 2 * 2] = [1 + 4] = 5
For k = 4, [ 1 + (4 -1) (2)] = [1 + 3 * 2] = [1 + 6] = 7
For k = 5, [ 1 + (5 -1) (2)] = [1 + 4 * 2] = [1 + 8] = 9
For k = 6, [ 1 + (6 -1) (2)] = [1 + 5 * 2] = [1 + 10] = 11
For k = 7, [ 1 + (7 -1) (2)] = [1 + 6 * 2] = [1 + 12] = 13
The correct answer is A. The sum of the first 7 odd numbers
Ответ:
The answer is C. This is because -5x10^2 = -500 7 5/16=7.3 132=11.48