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Question Number 32745 by vakil vishaWakrma last updated on 01/Apr/18
Thefirst,secondandmiddletermsofanAParea,b,crespectively.Theirsumis
Answered by Rasheed.Sindhi last updated on 01/Apr/18
LettheAPhasn(odd)termsandcommondifferenced.d=b−aThemiddleterm=(n+12)thterm=cc=a+(n+12−1)(b−a)n−12=c−ab−an=2(c−a)b−a+1=2c−2a+b−ab−a=−3a+b+2cb−aSum=(middle−term)×(numberofterms)=c×n=c(−3a+b+2cb−a)=cb−a(−3a+b+2c)
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