Find the sum of the following series up to n terms: (i) `5" "+" "55" "+" "555" "+" "dot" "dot" "dot` (ii) `. 6" "+dot" "66" "+dot" "666" "+dot" "dot" "dot`

Find the sum of the following series up to n terms: (i) 5" "+" "55" "+" "555" "+" . . . . (ii) . 6" "+.66" "+.666" "+. . . .

Find the sum of the following series whose n t h term is: (2n-1)^2dot

Find the sum of the following series whose n t h term is: n(n+1)(n+4)dot

Let A" "=" "{1," "2," "3," "4," "5," "6} . Insert the appropriate symbol in or !in in the blank spaces: (i) 5." "dot" "dotA (ii) 8" "..." "A (iii) 0." "dot" "dotA (iv) 4. ." "dot" "A (v) 2." "dot" "dotA (vi) 10." "dot" "

Find the sum of n terms of series 2.4+6.8+10.12+dots.

Find the number of terms in each of the following APs : (i) 7, 13, 19, . . . , 205 (ii) 18 ," "15 1/2," "13 ," "dot" "dot" "dot" "," " 47

Find the sum of 10 terms of the G.P.3,6,12,dots

Find the sum of n terms of the series 1.3.5+3.5.7+5.7.9+dots

Find the sum to n terms of the series : 3xxa^2+5xx2^2+7xx3^2+""dot""""dot""""dot

Find the number of dots in the pattern 143 of the following pattern.