Originally Posted by
simplekin Hello, here are a few formulas that will be given to us during an upcoming exam, and i dont know what each one does.
Tn = a + (n -1)d Mr F says: nth term of an arithmetic series whose first term is a and whose common difference is d.
Sn = n/2[2a + (n-1) d] Mr F says: Sum of the first n terms of an arithmetic series whose first term is a and whose common difference is d.
Sn = n/2(a +tn) Mr F says: Sum of the first n terms of an arithmetic series whose first term is a and whose nth term is tn.