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Question

The first term of an arithmetic sequence is 7 and the common difference is −2. What is its 12th term?


Solution

1st term of the arithmetic sequence = 7

Common difference = 2

To get the 12th term from the 1st term, we must add the common difference 11 times to the 1st term.

12th term = 7 + 11(2) = 7 − 22 = 15


Mathematics
Mathematics Part I
Standard X

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