A carpenter was hired to build 192 window frames. The first day he made 5 frames and each day, thereafter he made 2 more frames than he made the day before. How many days did he take to finish the job?
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Solution
We have 5+7+9+.....=192
As we know, Sn=n2{2a+(n−1)d}..............wherea=firstterm,n=no.ofterms,d=commondifference