1. 49 The value of n(n+n+1) is equal to (10a) [10a-3. The value of (a + ) is n=1 48 47 46 2 1 2. If + + + + + = (2)(3) (3)(4) (4)(5) (48)(49) (49)+(50) k is equal to 3. +++++ Then 4. 5. In a geometric progression the ratio of the sum of the first 5 terms to the sum of their reciprocals is 49 and sum of the first and the third term is 35. The fifth term of the G.P. is p, the value of 4p is 5-digit numbers are formed using 2, 3, 5, 7, 9 without repeating the digits. If p is the number of such numbers that exceed 20000 and q be the number of those that lie between 30000 and 90000 then 3p is q Rakshit is allowed to select 1 or more books out of (2n + 1) distinct books. If the number of ways in which he may not select all of them is 126, then value of n is