Question

How many terms of the ap 28,26,24...... must be taken so that the sum is zero

Answer 1

Answer:

in the AP,

a = 28

d= a2 - a1

= 26 - 28

= -2

n=?

Sn = 0

Sn = n / 2 [2a + (n-1)d ]

n/2 [ (2 × 28 ) + ( n-1)× -2 ] = 0

56 -2n +2 = 0

58 -2n = 0

58 = 2n

n = 29

therefore , 29 terms of the AP must be taken to get 0 as the sum

Answer 2

Step-by-step explanation:

The answer is 15th term.