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Mathematics, 04.03.2021 17:00 tommybear989

The sum of the first n multiples of nine greater than zero is given by the expression n/2(9n+9). Expand the equation by multiplying and then find the sum of the first fifteen multiples of nine greater than zero. I’ll give Brainliest!!

The sum of the first n multiples of nine greater than zero is given by the expression n/2(9n+9). Ex

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