1/20+1/30+1/42+1/56+1/72+1/90
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0.15 is the answer to the q/s u have gien
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= 1/20+1/30+1/42+1/56+1/72+1/90
= 126+84+60+45+35+28/2560
= 378/2560
= 3/20
= 0.15
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