If an denotes the nth term of the AP 3, 8, 13, 18, ..... then what is the value of (a30

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nth term of AP

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If a_n denotes the nth term of the AP 3, 8, 13, 18, ..... then what is the value of (a₃₀ – a₂₀) ?

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Here a = 3 and d = 5

$∴$ (a₃₀ – a₂₀) = (3 + 29 × 5) – (3 + 19 × 5) = 148 – 98 = 50.