Mathematics · Permutations and Combinations
'abc' रूप की तीन अंकों की संख्याएं बनाई जाती हैं, जहाँ सभी अंक a, b और c भिन्न हैं, a ≠ 0 है, तथा b = a + c है। ऐसी संभव तीन अंकों की संख्याओं की कुल संख्या कितनी है?
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