The 9th term of an AP is -32 and the sum o lf its 11th and 13th terms is -94 . Find the common difference of the AP.
Please answer it quickly
Answers
Answered by
0
Ans is d=5 check attachment for explanation
Attachments:
Answered by
1
Answer:
-5
Step-by-step explanation:
9th term = a+(9-1)d = a+8d = -32--(2)
11th term = a+(11-1)d = a+10d
13th term = a+(13-1)d = a+12d
a+10d+a+12d=-94
2a+22d=-94
a+11d=-47---(1)
(2)-(1):
-3d=15
d=-5
the common difference is equal to -5
Similar questions