Mathematics, 12.09.2021 09:00, jerlin1103

The sum of the first ten terms of an arithmetic progression consisting of positive integer terms is equal to the sum of the 20th, 21st, and 22nd terms. If the first term is less than 20, find how many terms are required to give a sum of 960.

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The sum of the first ten terms of an arithmetic progression consisting of positive integer terms is...