Posted by **Amir khan** on Sunday, September 25, 2011 at 7:34am.

1) The first term of arithmetic progression is -20 and the sum of it's term is 250. find it's last term if the number of it's terms is 10

2) Find the fifth term from the arithmetic progression -12, -9, -6 hence find the sum of it's first fifty terms.

3) The sum of the first terms in Arithmetic progression is equal to -24, and the sum of the last six terms equal to 30. if the number of it's term is 12. find a) it's common different

b) The first term

c) the last term

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