Question

1.Find the sum of the series :
(a) 2+4+6+8+... to 15 term
(b) 30+28+26+ ...20.​

Answer 1

Answer:

(a) 240

(b) 150

Step-by-step explanation:

(a)   2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30

    = 16(The average) × 15

   = 240

(b)   30 + 28 + 26 + 24 + 22 + 20

    = (24 + 26) × 3

    = 50 × 3

   = 150

Hope it's helpful.