Penjelasan dengan langkah-langkah:
a = b
b = +b
Sn = n/2.(2a+(n-1).b)
= n/2.(2.b+(n-1).b)
=nb +n.(n-1).b/2
= nb.(1+(n-1)/2)
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Penjelasan dengan langkah-langkah:
a = b
b = +b
Sn = n/2.(2a+(n-1).b)
= n/2.(2.b+(n-1).b)
=nb +n.(n-1).b/2
= nb.(1+(n-1)/2)