Question

3. What are the first three terms of the Arithmetic Sequence a, = 12 - 2(n - 1)?

11, 10,9
1,2,3
12,10,8
0 10 20​

Answer 1

12, 10, 8

Explanation:

Substitute n = 1, n = 2 and n = 3 to find the 1st, 2nd and 3rd terms of the sequence:

`a_n=12-2(n-1)`

`\implies a_1=12-2(1-1)=12-2+2=12\\\\ \implies a_2=12-2(2-1)=12-4+2=10\\\\ \implies a_3=12-2(3-1)=12-6+2=8`