Jawab:Un = 2n ( Genap )
U40 = 80
Sn = n/2 ( a + Un )
S40 = 40/2 ( 2 + 80 )
= 20 . 82 = 1640
Penjelasan dengan langkah-langkah:
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Jawab:Un = 2n ( Genap )
U40 = 80
Sn = n/2 ( a + Un )
S40 = 40/2 ( 2 + 80 )
= 20 . 82 = 1640
Penjelasan dengan langkah-langkah: