Mathematics, 13.09.2021 14:00, mamasmontoya

Given the sequence: 1;x; 6;y:15 ... The sum of the first four terms is 20 and the second differences are equal 1.1 Find a formula for the nth term Tn

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Given the sequence: 1;x; 6;y:15 ... The sum of the first four terms is 20 and the second differences...