The sum of series in ap is 40.5, the common difference is 2.5 and the last term is 13. find the first term and the number of the term in the series
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40.5=a+(n-1)d
d =last term
a=first term
40.5=a+n-1×13
find answer like this
d =last term
a=first term
40.5=a+n-1×13
find answer like this
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