perplexus.info :: Just Math : Counting triplets III

Counting triplets III (Posted on 2011-11-14)

Consider three prime numbers A, B and C with A ≤ B ≤ C ≤ 20, and determine the total number of triplets (A, B, C) such that the respective last digits of A+B+C and A*B*C are the same. No computer programs!

Submitted by K Sengupta

Rating: 5.0000 (1 votes)

Solution: (Hide)

The required total number of triplets is 39.
For an explanation, refer to the solution submitted by Charlie in this location.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
solution	Charlie	2011-11-14 16:07:47
answer	Dej Mar	2011-11-14 13:49:28

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