How many terms of the sequence 18,16,14........ should be taken so that their sum is zero

How many terms of the sequence 18,16,14........ should be taken so tha

1.	How many terms of the sequence 18,16,14........ should be taken so that their sum is zero
Answer» We know that\xa0sum = n/2(2a + (n-1) d) 0 = n/2(2 * 18 + (n - 1) * (-2)) 0 = n/2(36-2n+2) 0 = 38n - 2n^2 2n^2 - 38n = 0 2n(n-19) = 0 n - 19 = 0 n = 19. Ans is 19 term 19