Posted by Jennifer on Tuesday, May 1, 2012 at 11:29pm.
The 6th term of an A.P is twice the third and the first term is 3. Find the common difference and the 10th term.

Utech  Steve, Wednesday, May 2, 2012 at 10:23am
3+5d = 2(3+2d)
3+5d = 6+4d
d = 3
So, the sequence is
3, 6, 9, 12, 15, 18, 21, 24, 27, 30 ...
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