Two APs have the same common difference. The first term of one of these is –1 and that of the other is – 8. Then the difference between their 4th terms is
A. –1
B. – 8
C. 7
D. –9
Answer:C
Two APs have the same common difference. The first term of one of these is –1 and that of the other is – 8. Then the difference between their 4th terms is
A. –1 B. – 8 C. 7 D. –9
Explanation: The 4th term of first series is