The first term of an A.P is 2 and the common difference is 3 find the sum of the first 11 terms
a = 2 , d = 3
so just use the formula in your text or in your notes
sum(n) = (n/2)(2a + (n-1)d )
sum 11 = (11/2)(4 + 10(3))
= 11/2 (34)
= 11(17)
= 187