Question

an arithmetic progression has the first term [a] and the common difference [d].
[1] write down the third,ninth and twenty-fifth of the progression.
[2] the progression is increasing and the third,ninth and twenty-fifth term form the first three consecutive terms of geometric progression.if the sum of the seventh term and twice the sixth term of the arithmetic progression is 78.calculate the first term and the common difference and the sum of the fist nine terms of the arithmetic progression

Answer 1

Answer:

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Answer 2

Answer:

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Step-by-step explanation:

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