The sum of the first ten terms of an Arithmetic Progression (A.P.) is 130. If the fifth term is 3 times the first term, find the: common difference; first t...

The sum of the first ten terms of an Arithmetic Progression (A.P.) is 130. If the fifth term is 3 times the first term, find the:

1. common difference;
2. first term;
3. number of terms of the A.P. if the last term is 28.

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