1.

The difference between 12th and 8th term of an arithmetic sequence is 20. Find the common difference.

Answer»

12th term = f + 11d

8th term = f + 7d

Difference = f + 11d - (f + 7d) = 20

That is, 4d = 20, d = \(\frac{20}{4}=5\)

Common difference (d) = 5



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