Penjelasan dengan langkah-langkah:
a = 1
b = 2
Un = 99
a + (n-1)b = Un
1 + (n-1)2 = 99
1 + 2n - 2 = 99
2n = 99 - 1 + 2
2n = 100
n = 100/2
n = 50
Sn = n/2 (a + Un)
S50 = 50/2 ( 1 + 99 )
S50 = 25 ( 100 )
S50 = 2.500
Jadi, 1+3+5+7+9+...+99 adalah 2.500
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Penjelasan dengan langkah-langkah:
a = 1
b = 2
Un = 99
a + (n-1)b = Un
1 + (n-1)2 = 99
1 + 2n - 2 = 99
2n = 99 - 1 + 2
2n = 100
n = 100/2
n = 50
Sn = n/2 (a + Un)
S50 = 50/2 ( 1 + 99 )
S50 = 25 ( 100 )
S50 = 2.500
Jadi, 1+3+5+7+9+...+99 adalah 2.500