Question

ppzz solve it..10 standard​

Answer 1

Answer:-

Your Answer Is 1568.

Explanation:-

(See The Attachment(2) :)

Answer 2

Answer:

1568

Step-by-step explanation:

Given:

a19 + a38 = 56

To find:

S56

Solution:

an = a + (n-1)d

a19 = a + 18d

a38 = a + 37d

a19 + a38 = 56

a + 18d + a + 37d = 56

2a + 55d = 56.....equ 1

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

S56 = 56/2[ 2a + 55d ] .....substitute equ 1

= 28 (56)

S56 = 1568

Hope it helps you:)