1+2+3+... +24+25, Tentukan nilai S!
Penjelasan dengan langkah-langkah:
a = 1
y = 25
n = 25
S = n x ( a + y )/2
S = 25 x (1 + 25)/2
S = 25 x 26/2
S = 25 x 13
S = 325
1 + 2 + 3 + 4 + .... + 25
[tex] \rm S_n = \frac{n}{2} \times ( n+ 1) \\ \\ \rm S_{25} = \frac{25}{2} \times(25 + 1) \\ \\ \rm S_{25} = \frac{25}{ \not2} \times \cancel {26} \: ^{13} \\\\ \rm S_{25} = 25 \times 13 \\\\ \rm S_{25} = 325[/tex]
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