find the 10th term of an ap 21, 18, 15,_______ -30
Answers
Answered by
1
Answer:
a=21
d=-3
a(10)=a+(n-1)d
=21+(10-1)-3
21+(9)×-3
21-27=-6
Answered by
0
Step-by-step explanation:
a = 21
a+d= 18
d=(a+d-a)
d=18-21
d= -3
calculating a10
=a+9d
=21+9(-3)
=21+(-27)
= -6
Similar questions