Question

sum of 8 th term and 23 th term is 80 .what is the sum of 12 th and 19 th term​

Answer 1

Answer:

it's not deginable.... in this manner

Answer 2

Answer:

80

Step-by-step explanation:

Given :

$a_{8} + a_{23} = 80$

a+7d + a + 22d = 80

2a + 29d = 80  ------------(1)

now                                                               $a_n = a + (n-1)d$

to find

$a_{12} + a_{19}$

a + 11d + a + 18d

2a + 29d

from (1) 2a+ 9d = 80

therefore $a_{12} + a_{19}$ = 80