a = 6, b = 3, S₂₇ = ?
Answers
Answered by
4
Answer:
1215 is the answer..
s27=27x9/2+27^2x3/2=243/2+2187/2=2430/2
=1215
mark as brainliest......
hope this may hlp u
Answered by
1
Answer:
891
Step-by-step explanation:
a=6,d=3-6=-3,
S²⁷=n/2[2a+(n-1)d]
=27/2[2*6+(27-1)-3]
=27/2[12-78]
=27/2*-66
=27*-33
=897
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