SOLUTION: Please help me solve this question: In an arithmetic progression,the 6th term is twice the 4th term and the 3rd term is 15.Find the first term and the common difference.

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Question 481956: Please help me solve this question: In an arithmetic progression,the 6th term is twice the 4th term and the 3rd term is 15.Find the first term and the common difference.
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The 3rd term is given as 15

The 4th term is 15 + d

The 5th term is 15 + 2d

The 6th term is 15 + 3d

But since the 6th term is 2 times the 4th:





The 3rd term is 15 so the 2nd term is 15 - 15 = 0 and the 1st term is 0 - 15 = -15.


John

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