diket:
b: 2
a: 6
ditanya:
S3:...?
jawab:
Sn= n/2 {2a×(n-1)b}
=3/2 {2.(6)×(3-1) 2}
=3/2{12×(2).2}
=3/2{12×4}
=3/2{48}
=72
semoga membantu^_^
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diket:
b: 2
a: 6
ditanya:
S3:...?
jawab:
Sn= n/2 {2a×(n-1)b}
=3/2 {2.(6)×(3-1) 2}
=3/2{12×(2).2}
=3/2{12×4}
=3/2{48}
=72
semoga membantu^_^