[Think] 7 coins, 2 heavier. Only 3 times to figure out.

This is one logic test from JobDiva which Glenn engaged yesterday. Here is the statement:

7 coins, 2 are heavier, say A, B. (A and B are in the same weight)
Here is a scale
You need to find out the two heavier coins in 3 time of the scale usage.

Due to the value is not  the general case listed on Google or Yahoo! Knowledge which is even. Besides, this problem requires to find out 2 heavier coins. If you are interested in this problem, you might think about it.

Here is my answer. (Only for reference)

BS_7coins2

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