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

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(52788) (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) (Show Source): You can put this solution on YOUR website!
Assuming arithmetic progression,
.
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