(i) 34 +32+30+...+10 – InterviewSolution

InterviewSolution

1.	(i) 34 +32+30+...+10
Answer» a=34 d=-2 tn=a+(n-1)d 10=34+(n-1)-2 -14=(n-1)(-2) n-1=7 n=8 Sn=n(2a+(n-1)d)/2 S8 =8(2×34+(8-1)(-2))/2S8=8(68-14)/2S8=4(54) S8 = 216

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