what is the sum of the following finite sequence terms? 18, 25, 32,39,...67
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Answer:
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Step-by-step explanation:
25-18=1234566779309
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Step-by-step explanation:
it is an AP as difference of consecutive terms is constant
32-25=7, 39-32=7
67=Nth term of this AP
67=a+(N-1)d where a=first term=25 and d=7 common difference
67=25+(N-1)×7
(67-25)/7=N
N=42/7=6 thus there are total 6 terms in this AP
SN=sum of N terms=(a+last term)×N/2
SN=(25+67)×6/2=92×3
=276
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