Find the sum `3+7+14+24+37+…..20 ` terms

Find the sum of -7-4-1 + 2…. to 20th term.

Find the sum of: 24 terms and n terms of 2 (1)/(2) , 3 (1)/(3) , 4 (1)/(6) ,5 ,......,

Find the sum of (i) 20 terms (ii) n terms of the progression 1,3,5,7,9, ....

Find the sum of the series to n terms :3+7+14+24+37....

Find the sum of first 24 terms of the AP 5, 8, 11, 14,…

Find the sum of first 14 terms of the sequence -3,3,9,15,…….

If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms. OR Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.

Find the sum of first 20 terms of an A.P., in which 3r d terms in 7 and 7t h term is tow more than thrice of its 3r d term.

Find the sum of first 20 terms of an A.P.in which 3rd terms in 7 and 7th term is tow more than thrice of its 3rd term.

Find the sum of first 20 terms of an A.P., in which 3rd term is 7 and 7th term is two more than thrice of its 3rd term.