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calculate the volume of o2 and volume al needs photon combison on 18 kg at carbon

a new colony was built and the builder gave contract to a sign maker to number the buildings from number 1 to 500.How many zeroes will the need?

A boy has rs728 in denomination of rs 2 notes, rs 5 notes and rs 10 notes in the ratio of 3:2:4, respectively. What is the total number of notes he has? (A)104 (B)127 (C)100 (D)117

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