factorise the following number by factor tree method. 385
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Explanation:
1² = 1
1² + 2² = 5
1² + 2² + 3² = 14
1² + 2² + 3² + 4² = 30
1² + 2² + 3² + 4² + 5² = 55
1² + 2² + 3² + 4² + 5² + 6² = 91
1² + 2² + 3² + 4² + 5² + 6² + 7² = 140
1² + 2² + 3² + 4² + 5² + 6² + 7² + 8² = 204
1² + 2² + 3² + 4² + 5² + 6² + 7² + 8² + 9² = 285
1² + 2² + 3² + 4² + 5² + 6² + 7² + 8² + 9² + 10² = 385
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