1+6+4+9+7+12+………..to 40 terms

Find 2 xx 5 xx 8 + 4 xx 7 xx 10 + 6 xx 9 xx 12 ……. Upto n terms.

Find the sum of the series : 3+6+9+12……………… to 40 terms .

Find 2 xx 6 + 4 xx 9 + 6 xx 12 + …… upto n 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 series 1+4+7+10+....... to 40 terms.

Find 1.4.7 + 3.6.9 + 5.8.11 + 7.10.13 …. Upto 'n' term.

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