If the first term of an AP is 'a' and the common difference is 'd', then the sum of n terms of an AP is

If the first term of an AP is 'a' and the common difference is 'd', then the sum of n terms of an AP is

they are simplified

step-by-step explanation:

saving = more money

step-by-step explanation:

if you have 100 bucks, and you want to buy a candy bar, even if you have one at home, if you choose not to buy it, you save.

~courtney