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Question

The common difference of an arithmetic sequence is −1 and its 4th term is 7. What is its 7th term? And the 11th term?


Solution

4th term of the arithmetic sequence = 7

Common difference = 1

To get the 7th term from the 4th term, we must add the common difference three times to the 4th term.

7th term = 7 + 3(1) = 7 − 3 = 4

To get the 11th term from the 4th term, we must add the common difference seven times to the 4th term.

11th term = 7 + 7(1) = 7 − 7 = 0


Mathematics
Mathematics Part I
Standard X

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