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andreyandreev [35.5K]
2 years ago
5

The 15th term of an arithmetic series is

Mathematics
1 answer:
RSB [31]2 years ago
7 0

Answer:

-1557

Step-by-step explanation:

a+14d=143

a+12d=183

--------------------

2d= -40

d= -20

a=183+240=423

a(100th)= 423+99*-20=423-1980= -1557

I hope that help =)

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