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ARITHMETIC SEQUENCE

• Find the common difference.

• Since the sequence is decreasing, set the common difference to negative. The a1 is the first term and the n^th term is the term we were finding.

• Following the formula of arithmatic sequence, subtitute the numbers.

Thus, the number of plants in the seventh row of the triangular garden is 1.

PS. First time kong sumagot ng Sequences since I'm not still on 10th grade.

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