sum of arithmetic sequence

find the sum of numbers between 201 and 301 which are not divisible by 3
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1 Answer

numbers tween 201 & 301...thats 202, 203, 204....300

sum=24,849

start number=202

last number=300

num numbers=99

averaej=(start numb +last numb)/2=(202+300)/2=251

sum=n*averaej=99*251
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