Question

If the first term of an AP is -5 and the common difference is 2,then the sum of the first 6 terms is____
a)0 (b)5 (c)6 (d)15.​

Answer 1

Answer:

(b) 5

tn = a + (n_1) ×d

t6= -5 +(6-1) ×2

t6= -5+10

t6= 5