Find the sum of first 60 positive integer multiples of 6
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the series will be 6+12+18+24..............+360
so by formula of addition of ap
we have a=6 l=360 and n=60
s60=60/2(6+360)
s60=30*366
s60=10980
so by formula of addition of ap
we have a=6 l=360 and n=60
s60=60/2(6+360)
s60=30*366
s60=10980
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