Discussion
The number of terms in the A.P. 2, 5, 8, ..., 59 is:
Answer: B
\[ a_{n} = a + (n-1)d \quad\Longrightarrow\quad 59 = 2 + (n-1)3 \]
\[ 57 = 3(n-1) \quad\Longrightarrow\quad n = 20 \]
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