How many terms are in the arithmetic sum 15 + 18 + 21 + … + 99?

n = 1,653

n = 28

n = 27

n = 29

Question

24-05-2018
Mathematics

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How many terms are in the arithmetic sum 15 + 18 + 21 + … + 99?

n = 1,653

n = 28

n = 27

n = 29

Respuesta :

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sqdancefan sqdancefan · Answer 1 · 2018-05-24T18:54:58+02:00

sqdancefan sqdancefan

24-05-2018

The n-th term is
a(n) = 15 + 3(n-1)
Then the last term corresponds to the value n that satisfies
99 = 15 +3(n -1)
33 = 5 +(n -1)
29 = n

The appropriate choice is ...
n = 29

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How many terms are in the arithmetic sum 15 + 18 + 21 + … + 99? n = 1,653 n = 28 n = 27 n = 29

Respuesta :

Otras preguntas

How many terms are in the arithmetic sum 15 + 18 + 21 + … + 99?

n = 1,653

n = 28

n = 27

n = 29