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In an arithmetic sequence with 25 terms, if the first term is 60 and last term i...


Question

In an arithmetic sequence with 25 terms, if the first term is 60 and last term is -12 the common difference is

Options

A) 3

B) 2

C) -3

D) -2

The correct answer is C.

Explanation:

\(L=a+[n-1]d; L=-12, a=60, n=25\)
\(-12=60+[25-1]d\)
\(-12=60+[24d]\)
\(-12-60=24d\)
\(24d =-72\)
\(d=-\cfrac{72}{24}\)
\(d=-3\)

Explanation provided by Ayoola Favour


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