Question

The second term of an arithmetic sequence is 18 and its fourth term is 32.Write its third and first terms​

Answer 1

Answer:

3rd term = 25 and 1st term = 11.

Step-by-step explanation:

a + d = 18 - (1)

and a + 3d = 32 - (2)

Subtracting eq (1) from (2) , we get 2d = 14

d = 14/2 = 7

Putting d = 7 in eq (1) , we get

a + 7 = 18

a = 18 - 7

a = 11

Now the third term = a + 2d = 11 + 2 (7)

= 11 + 14

= 25

and first term = a = 11.