Write the terms of the sequence `5xx(1+6)`, `10xx(2+6)`, `15xx(3+6)`, `20xx (4+6)`in the form first term `5xx1(1 + 6)`, second term `5xx2(2 +6)`.Write its algebraic expression.

Write the terms of the sequence '5 xx(1+6), 10 xx(2+6), 15 xx(3+6),20 xx(4+6) …...' in the form, first term '5 xx 1(1+6)', second term '5 xx 2(2+6)' i)Write its algebra.

Find the 10^th term of the sequence -6,-11/2,-5 ,…………...

Find the sum to n terms of the series 3xx1^2+5xx2^2+7xx3^2+ ……..

Find the sum to n terms of the series . 1 xx 2 xx 3+2 xx 3 xx 4+3 xx 4 xx 5+. . .

Find the sum to n terms of the series 1 xx 2+2 xx 3+3 xx 4+4 xx 5 dot+

Find the sum to n terms of the series 3xx1^2+5xx2^2+7xx3^2+ ………

Sum of first 9 terms of an arithmetic sequence is 261, and the sum of next 6 terms is 444. i)- Find the first term and common difference. ii) Write the algebraic form of the sequence: iii) Write the algebraic.form of the sum.

Write the algebraic form of the sequence and its sum of n terms. 5,10,15,20, ...

Find the 20^( th) term of the series 2 xx 4+4 xx 6+6 xx 8+. . .,+ n terms.

Find the sum to 'n' terms of the series 3xx8+6xx11+9xx14+…....