Q1.What is the sum of a 10-term arithmetic sequence where the first term is 3 and the last term is 75

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Q1.What is the sum of a 10-term arithmetic sequence where the first term is 3 and the last term is 75

[From: ] [author: ] [Date: 12-01-09] [Hit: ]

What is the sum of a 12-term arithmetic sequence where the last term is 13 and the common difference is -10?find the 1st term ,......

Q2.What is the sum of the arithmetic sequence 22, 13, 4 ... if there are 28 terms?
Q3.What is the sum of a 12-term arithmetic sequence where the last term is 13 and the common difference is -10?

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1/
use formula ---> S = 5(3+75) = 390
2/
S = 14[2(22) + 27(-9)] = -2786
3/
find the 1st term , then use the formual for the sum

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