Find the sum of the products of the ten numbers `+-1,+-2,+-3,+-4,a n d+-5` taking two at a time.

There are two sets A and B each of which consists of three numbers in A.P.whose sum is 15 and where D and d are the common differences such that D-d=1. If p/q=7/8 , where p and q are the product of the numbers ,respectively, and d gt 0 in the two sets . The sum of the products of the numbers is set A taken two at at time is

Find the sum of all the numbers that can be formed with the digits 2, 3, 4, 5 taken all at a time.

If the product of n positive numbers is n^n . Then their sum is

Consider the ten numbers a r ,a r^2, a r^3, ,a r^(10)dot If their sum is 18 and the sum of their reciprocals is 6, then the product of these ten numbers is 81 b. 243 c. 343 d. 324

Find a cubic polynomial with the sum, sum of the product of zeroes taken two at a time, and the product of its zeroes as 2,-7,-14 respectively.

Find the sum to n terms of the series 1^2+2^2+3^2-4^2+5^2-6^2+. . . .

The product of n positive numbers is 1, then their sum is a positive integer, that is