SOLUTION: The term of an arithmetic series is 2 & the common difference is 3. The sum is 187. how many terms are in the series

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Question 979190: The term of an arithmetic series is 2 & the common difference is 3. The sum is 187. how many terms are in the series
Answer by anand429(138) About Me  (Show Source):
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a=2,d=3
S=187
no of terms =n
%28n%2F2%29%2A%282a%2B%28n-1%29%2Ad%29=187
=> %28n%2F2%29%2A%284%2B%28n-1%29%2A3%29=187
=> %28n%2F2%29%2A%281%2B3n%29=187
=> 3n%5E2%2Bn-374+=+0
=> n=11