Find the sum of the first 22 terms of the ap 8,3,-2.......
Answers
Answered by
13
HEY MATE!
HERE IS YOUR ANSWER:
________________________________☆
In the AP 8,3,-2.....
first term (a)=8
common difference (d)=3-8=-5
number of terms (n)=22
Sum of first 22 terms =n/2[2a+(n-1)d]
S22=22/2[2×8+(22-1)-5]
S22=11[16+(21)-5]
S22=11[16-105]
S22=-976
Answered by
15
Step-by-step explanation:
a = 8
d=3-8 = -5
S²² = n/2{2a +( n-1)d}
= 22/2 { 2×8 + 21× (-5)}
= 11 ( 16 - 105)
= 11×(-89)
=-979
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