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In a sequence, t₅ = 17 and t₁₀ = 37. If it is arithmetic, what is the common difference?

A2
B3
C4
D5
Answer & Solution
Correct answer: C. 4
In an arithmetic sequence, between t₅ and t₁₀ there are 5 differences. **So 5d = t₁₀ − t₅ = 37 − 17 = 20, giving d = 4.**
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