Find the number of terms in the series `20 ,19 1/3,18 2/3...` the sum of which is 300. Explain the answer.

Find the sum of 6 terms of the series 2+6+18+…..

Find the sum of 6 terms of the series 2+6+18+…..

Find the sum of the first 8 terms of the series 2,6,18,54.

Find the sum of 10 terms of the series 1+sqrt(3)+3+….

Find the sum of 10 terms of the series 1+sqrt(3)+3+….

Find the number of terms of the series 21, 18, 15, 12...which must be taken to give a sum of zero.

Find the sum of the series : 1+ 2/3+1/3+0 +…….. To 19 terms.

How many terms of the series 20+19(1)/(3)+18(2)/(3)+"...." must be taken to make 300? Explain the double answer.

Write the sum of 20 terms of the series: 1+1/2(1+2)+1/3(1+2+3)+

Write the sum of 20 terms of the series: 1+1/2(1+2)+1/3(1+2+3)+