Exam Maths Puzzle General Ability

∑(from n=1 to ∞)arctan t/1+ar.ar+1 where an is decreasing AP with first term 1 and common difference is d

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Exam Other Question

A dealer allows 16% discount to a retailer and retailer allows 10% discount to a customer. These both discounts are given on the painted price of the book. If the customer pays Rs. 270 for a book and the dealer makes a profit of 5% what is the C.P. of the book for the dealer? If two positive numbers are in the ratio 5:2 , then by what percent is the second number less than the first?