Question

difference between 12th term and 8th term of an arithmetic sequence is 20. find the common difference​

Answer 1

Answer:

d = 20/3 or 6.66

Step-by-step explanation:

a12 - a8 = 20

a + (11-1)d - [ a + (8-1)d] = 20

a + 10d - a - 7d = 20

3d = 20

d = 20/3 = 6.66...

Answer 2

Answer:

5

Step-by-step explanation:

T12-T8=20

N term=a+(n-1)d

a+(12-1)d-a+(8-1)d=20

11d-7d=20

4d=20

d=20/4

d=5