How many terms of the AP 26, 21 16, 11, …. are needed to give the sum 11?

How many terms of the AP 26, 21 16, 11, …. are needed to give the sum 11?

How many terms of the AP 26, 21 16, 11, …. are needed to give the sum 11?

How many terms of the AP 26, 21 16, 11, …. are needed to give the sum 11?