Question

find the number of term in each of the following APs
$18 \: \: 15 \times \frac{1}{2} \: \: 13 \: \: \: \: \: \: \: \: - 47$
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Answer 1

The given AP is 18, 15 1/2, 13, ....., -47

see the attachment.................

Hence, there are 27 terms in the given AP.