Jawab:
A. Sn=n/2(2a+(n-1)b
S3=3/2(2.1+(3-1)1
s3=3/2(2+(2)1
s3=3/2(4)1
s3=3/2 x 4
S3= 3 X 2
s3=6
B.sn=n/2(2a+(n-1)b
s3=3/2(2.2+(3-1)3
s3=3/2(4+(2)3
s3=3/2(4+6)
s3=3/2 x 10
s3=3 x 5
s3=15
C.sn=n/2(2a+(n-1)b
s3=3/2(2.2+(3-1)8
s3=3/2(4+(2)8
s3=3/2(4+16)
s3=3/2 x 20
s3=3 x 10
s3=30
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Jawab:
A. Sn=n/2(2a+(n-1)b
S3=3/2(2.1+(3-1)1
s3=3/2(2+(2)1
s3=3/2(4)1
s3=3/2 x 4
S3= 3 X 2
s3=6
B.sn=n/2(2a+(n-1)b
s3=3/2(2.2+(3-1)3
s3=3/2(4+(2)3
s3=3/2(4+6)
s3=3/2 x 10
s3=3 x 5
s3=15
C.sn=n/2(2a+(n-1)b
s3=3/2(2.2+(3-1)8
s3=3/2(4+(2)8
s3=3/2(4+16)
s3=3/2 x 20
s3=3 x 10
s3=30
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