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For the sequence 7, 12, 17, 22, …, what is the 20th term?

A97
B102
C105
D112
Answer & Solution
Correct answer: B. 102
This is an arithmetic sequence with first term a = 7 and common difference d = 5. The nth term is tₙ = a + (n−1)d = 7 + (n−1)(5) = 5n + 2. So t₂₀ = 5(20) + 2 = 102.
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