perplexus.info :: Just Math : Divisible by 28

Divisible by 28 (Posted on 2014-12-21)

Each of a, b and c is a positive integer with a ≤ b ≤ c ≤ 70.

Find total number of triplets (a, b, c) such that a² + b² + c² is divisible by 28.

See The Solution Submitted by K Sengupta

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