How many terms has an arithmetical progression (an), where n> = 1, r = 3, an = 16 and the sum of the first n terms of progression is Sn = 50?

How many terms has an arithmetical progression (an), where n> = 1, r = 3, an = 16 and the sum of the first n terms of progression is Sn = 50?

How many terms has an arithmetical progression (an), where n> = 1, r = 3, an = 16 and the sum of the first n terms of progression is Sn = 50?

How many terms has an arithmetical progression (an), where n> = 1, r = 3, an = 16 and the sum of the first n terms of progression is Sn = 50?

How many terms has an arithmetical progression (an), where n> = 1, r = 3, an = 16 and the sum of the first n terms of progression is Sn = 50?