Question

 Find the sum of first 15 terms of the A.P. 0,3,6,​

Answer 1

Step-by-step explanation:

Arithmetic Progression. Prove that the sum Sn of n terms of an Arithmetic Progress (A.P.) whose first term ' a' ... S = {a + (n - 1)d} + {a + (n - 2)d} + {a + (n - 3)d}