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The first term of an ap is -5 and the the common difference is -2 then the sum of first 6 team is

Posted by Rekha Tiwari 5 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Chandresh Tiwari 5 years, 4 months ago

Given a =-5 and d=-2 , n= 6 To find 6th terrm so here we will use Sn formula : Sn=n/2{a+(n-1)d} Putting the given values on this formula: Sn =6/2{-5+(6-1)-2} S6= 3{-5+(5×(-2)} S6=3(-5-10) S6=3×(-15) S6=-45

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