Calculate the difference between the sum of the first 20 terms of the arithmetic sequences 6,10,14,….. and 15,19,23,…….

What is the sum of the first n term of the arithmetic sequence 1,3,5,7......?

What is the sum ofthe first 5 terms ofthe arithmetic sequence 1, 3, 5, 7,……... ?

What is the difference between the sum of the first 20 terms and.the next 20 terms. of the arithmetic sequence 6,10,14,……..?

What is the sum of the first 5 terms of the arithmetic sequence 1,3,5,7,........?

Find the sum of the first n terms of the arithmetic sequence 1/n,3/n,5/n,7/n ,.......

What is the 21^(st) term of the arithmetic sequence 21, 20, 19,......?

Can 240 be the sum of consecutive terms of an arithmetic sequence '7,11,15, ………..'

Find the sum of first 11 terms of the sequence 20,25,30.......

What is the sum of first 2020 terms of the arithmetic sequence 1/2020 , 3/2020 , 5/2020 ,.......?

How many terms of the arithmetic sequence '6,10,14, ……….' should be added to get 720?