Find the sum of the first 22 terms of the ap 8,3,-2,.....(use formula)
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a= 8
d=3-8
=-5
n=22
Sn= n÷2 (2a+(n-1)×d)
Sn =22÷2 (2×8+(22-1)×-5)
Sn =11 (16+(21)×-5)
Sn =11 (16-105)
Sn =11×89
Sn = 979 answer
d=3-8
=-5
n=22
Sn= n÷2 (2a+(n-1)×d)
Sn =22÷2 (2×8+(22-1)×-5)
Sn =11 (16+(21)×-5)
Sn =11 (16-105)
Sn =11×89
Sn = 979 answer
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