Question

Q2 Which term of an A.P 21,18,15,...is -81? 1 point
O a) 35
O b) 40
O c) 45
O d) 50​

Answer 1

Answer:

40...................

.

Answer 2

Answer: a) 35

Step-by-step explanation:

first term a = 21

common difference d = a2-a1 = 18-21 = -3

an = a + (n-1) d => -81 = 21 + (n-1) -3

-81-21/-3 = n-1

-102/-3 = n-1

34 = n-1

n = 34 +1 = 35