the common difference of an arithmetic sequence is 6. what is the difference between 40th term and 20th term?
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The difference between 40th term and 20th term = 120
Step-by-step explanation:
Common difference (d) = 6
T₂₀ = a + (20-1) d = a + 19d
T₄₀ = a + (40-1) d = a + 39d
T₄₀ - T₂₀ = a + 39d - a - 19d
= 20d
= 20 x 6
T₄₀ - T₂₀ = 120
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