Find the sum of all multiples of 4 lying between 200 and 600
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a= 600
d=-4
400/2[2×600+(400-1)×(-4)]
200[1200+399×(-4)]
200[1200+(-1596)]
200[1200-1596]
200[-396]
79200 Ans..
d=-4
400/2[2×600+(400-1)×(-4)]
200[1200+399×(-4)]
200[1200+(-1596)]
200[1200-1596]
200[-396]
79200 Ans..
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