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3 years ago

3.

Mathematics

2 answers:

zheka24 [161]3 years ago

6 0

Answer:

Step-by-step explanation:

Sn = (n/2)(a1 + a1 + d(n-1)), where S = sum, a1 = first term, n = number of terms, d = common difference

400 = (n/2)(1 + 1 + 2(n - 1))

400 = (n/2)(2 + 2n - 2)

400 = (n/2)(2n

400 = n2

20 = n

Twenty numbers are in the set.

Lesechka [4]3 years ago

3 0

Answer:

Step-by-step explanation:

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