Mathematical sequence problem in senior three. - Training Enrollment Network

Mathematical sequence problem in senior three.

Hello students, please remember the nature of geometric series: SK, S2K-SK, S3K-S2K ... into geometric series.

Arithmetic progression has similar properties: sk, s2k-sk, s3k-s2k ... become arithmetic progression.

S3, S6-S3 and S9-S6 are geometric series, so S6-S3=6 and S3=3, so S6=9.

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