SOLUTION: Find the sum of the 1st to 50th terms where a1= 2.1 and a50= 1.2

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Question 1035986: Find the sum of the 1st to 50th terms where a1= 2.1 and a50= 1.2
Found 2 solutions by ikleyn, robertb:
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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Find the sum of the 1st and 50th term where a1= 2.1 and a50= 1.2
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2.1 + 1.2.

What can be easier?


Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming arithmetic progression,
S%5B50%5D+=+%2850%2F2%29%28a%5B1%5D%2Ba%5B50%5D%29+=+25%2A%282.1%2B1.2%29+=+165%2F2+=+82.5.