The sum of the products of 2n numbers `pm1,pm2,pm3, . . . . ,n` taking two at time is

Find the sum of the products of the ten numbers pm1,pm2,pm3,pm4, and pm5 taking two at a time.

Find the sum of the products of the ten numbers pm 1, pm2, pm 3, pm4 and pm 5 taking two at a time .

Statement 1 The sum of the products of numbers pm a_(1),pma_(2),pma_(3),"....."pma_(n) taken two at a time is -sum_(i=1)^(n)a_(i)^(2) . Statement 2 The sum of products of numbers a_(1),a_(2),a_(3),"....."a_(n) taken two at a time is denoted by sum_(1le iltjlen)suma_(i)a_(j) .

Statement 1 The sum of the products of numbers pm a_(1),pma_(2),pma_(3),"....."pma_(n) taken two at a time is -sum_(i=1)^(n)a_(i)^(2) . Statement 2 The sum of products of numbers a_(1),a_(2),a_(3),"....."a_(n) taken two at a time is denoted by sum_(1le iltjlen)suma_(i)a_(j) .

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

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

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

Every number is one of the forms 5n, 5n pm 1, 5n pm 2 .