4. The 1st term of an A.P. is -54 and 16th term is 21. Find the 12th term.
Answers
Answered by
3
Answer:
-31/2
Step-by-step explanation:
a21=a+20d=16
-54+20d=16
20d=16+54
20d=70
d=70/20=7/2
a12=a+11d
-54+11*7/2=-54+77/2
-108+77/2=-31/2
Similar questions