Find the sum `0.5+0.25+0-0.25`....... upto 16th term.

Find the sum 2+3fr1/2+5+6fr1/2 +....... upto 25th term.

Find the sum of 1.5+2.2+2.9+...upto 25th term.

Find the sum 5+17+29+41 ......upto 20th term.

Find the sum (1-1/n)+(1-2/n)+(1-3/n) +........upto n terms.

Find the sum of the following AP up to the specified term 20+ 18+ 16….. Upto 12th term.

Find the sum of the following series up to the specified term 1 + 3 + 5 + 7….. upto 30th term.

Find the sum of the following AP up to the specified term 2 + 6 + 10 + …...upto 50th term.

Find the sum of the following AP up to the specified term 1/2+1/3+1/6+ …... upto 9th term.

Find the sum of the following series up to the specified term (x-y) + (2x-3y) + (3x-5y)+ ….. upto nth term.

If the sums of an A.P. upto pth, qth and rth terms are a, b and c respectively, prove that- a/p(q-r)+b/q(r-p)+c/r(p-q)=0 .