kv Exam Numerical Ability

1/1*3*5+1/3*5*7+........+1/13*15*17 is

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A trader allows a discount of 10% on the marked price of an article and thus gains 17% on the cost price of the article .If the cost price is increased by 10 % ,how much discount percent should be allowed on the marked price so as to earn the same percentage of profit. If the area of a square inscribed in a circle is 15 cm2 ,then the area (in cm2) of the square inscribed in the semicircle of the same circle is ?