Question

40+36+32+....+0 find the series​

Answer 1

-4...................

Answer 2

since its a q of ap ,

$a = 40 \\ d = 36 - 40 = - 4 \\ l = 0 \\ l = a + (n - 1)d \\ 0 = 40 +( n - 1) - 4 \\ \\ n = 11$