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7nadin3 [17]
3 years ago
15

Helpppppppppppppp!!!!!!!!!!!!!!!

Mathematics
2 answers:
Blababa [14]3 years ago
7 0
7/18 because 7 times 1 is 7 and 9 times 2 is 18 :)
amid [387]3 years ago
6 0
\frac{7}{18}


Good luck! (:
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Read 2 more answers
A) If the 5th term of an A.P. is double the 7th term, show that the sum of the 17 terms zero.​
gayaneshka [121]

Answer:

see explanation

Step-by-step explanation:

The nth term of an AP is

a_{n} = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

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4d = a₁ + 12d ( subtract 12d from both sides )

- 8d = a₁

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S_{n} = \frac{n}{2} [ 2a₁ + (n - 1)d ] , substitute values

S_{17} = \frac{17}{2} ( 2(- 8d) + 16d)

     = 8.5(- 16d + 16d)

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Step-by-step explanation:

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