find the sum of the 40 positive integer which are divisible by 6
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ans=10
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1+1+1+1+1+1+1+1+1+1+1+1 +1+1+1+1+1+1+1+1
+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+12+10=60=6×10
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