Find the sum of the series 99+95+91+87+… to 20 terms.

Find the sum of the series : 4+2+0-2-4………. To 20 terms.

Find the least value of n for which the sum of the series 20 + 28 + 36 +… to n terms is greater than 1000.

Find the sum of the series 101+99+97+95+…..+43

Find the sum of the series 3 + 7 + 13 + 21 + 31 + … to n terms . Find the sun when n=20

Find the sum of the series 3 + 7 + 13 + 21 + 31 + … to n terms . Find the sun when n=20

Find the sum of each of the series : 5-10 +20 - .. "to" 6 terms.