Question

9) Find the sum of the first 15 multiples of 8
Solution : First 15 multiples of 8 are 8, 16, -
Which is in AP, where a = --- ,d=--- , n =
Now use S. = (a + an ) and find Sis = ?
120
-, ais = 120​

Answer 1

Answer:

The answer is 240 by solving this sum.

Answer 2

Step-by-step explanation:

sum of first 15 multiples of 8 = 960