Discussion
In the series 3, 9, 15, ...... what will be the 21st term?
Answer: C
Correct answer: 123
The series rises by 6 each time, so the \( n \)th term is \( 3 + (n-1)\times 6 \). For the 21st term, \[ 3 + 20 \times 6 = \mathbf{123} \]
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