The LCM of 3a$^{2}$ bC, 5 ab$^{2}$ C, 7 abC$^{2}$
35 a$^{2}$bC$^{2}$
105 a$^{2}$b$^{2}$ c$^{2}$
15 a$^{2}$b$^{2}$C$^{2}$
105 abc
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The cost price of 11 pens is equal to the selling price of 10 pens. The profit per cent is
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