Question

Two APs have same common difference. the first term of one AP is -1 and that of the other is -8. the difference between their fourth term is

Answer 1

Step-by-step explanation:

given

first term of 1stAP= -1

first term of 2nd AP= - 8

fourth term of 1st AP= -1+(4-1)d= 3d-1

fourth term of AP 2nd= -8+(4-1)d= 3d- 8

difference= I (3d-8) - (3d-1)I= I-7I= 7

ans = 7

note- mode I. I is taken for positive value.