find the maximum sum of the AP 30 27 24 21 18
Answers
Answered by
0
Answer:
=5/2(30+18)
=5/2*48
=120
Answered by
0
Answer:
Step-by-step explanation:
a=30 , d=27-30 , n=?
=-3
an=a+(n-1)d
=30+(n-1)-3
-30=-3 (n-1)
n-1= -30/-3
n-1=10
n=11
Sn=n/2 [2a+(n-1)d]
=11/2 [2×30+(11-1)-3]
=11/2 [60-30]
=11/2 [30]
=11×15
=165
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