[" 3.Find the sum of the following series: "],[[" (i) "2+4+6+...." to "40" terms."," (ii) "1+4+7+10+]]

Find the sum of the following series 1 + 2 + 4….. to tenth term.

Find the sum of the following series : 2^2+4^2+6^2 + .... to n terms .

Find the sum of the following APs : (i) 2, 7, 12, . . . , to 10 terms.

Find the sum of the following series: 1+4+7+10+… to 40 terms

Find the sum of the following series: 1+4+7+10+...rarr40 terms

Find the sum of the following series (1)+(2+3)+(4+5+6)+(7+8+9+10)+…to n terms.

Find the sum of the following arithmetic series : 1+4+7+10+13+…. to 20 terms

Find the sum of the following arithmetic progressions: (i) 50 ,\ 46 ,\ 42 ,\ ... to 10 terms (ii) 1,\ 3,\ 5,\ 7,\ ... to 12 terms (iii) 3,\ 9//2,\ 6,\ 15//2,\ ... to 25 terms

Find the sum of the following APs. (i) 2,7,12,……., to 10 terms.