Pola = 12, 20, 28, ...
→ U2 - U1
→ 20 - 12
→ 8
[tex] \tt S_n = \frac{n}{2}(2a + (n-1)b)[/tex]
[tex] \tt S_{7} = \frac{7}{2}(2(12) + (7-1)(8))[/tex]
[tex] \tt S_{7} = \frac{7}{2}(24 + (6)(8))[/tex]
[tex] \tt S_{7} = \frac{7}{2}(24 + 48)[/tex]
[tex] \tt S_{7} = \frac{504}{2}[/tex]
[tex] \tt S_{7} = 252 [/tex]
-
Maka, jumlah batang korek api yang dibutuhkan dari pola ke-1 sampai ke 7 adalah 252
[tex]\purple{\boxed{\blue{\boxed{\green{\star{\orange{\ \: \: \mathcal{JK} \: \: \: {\green{\star}}}}}}}}} [/tex]
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Verified answer
Pola = 12, 20, 28, ...
→ U2 - U1
→ 20 - 12
→ 8
[tex] \tt S_n = \frac{n}{2}(2a + (n-1)b)[/tex]
[tex] \tt S_{7} = \frac{7}{2}(2(12) + (7-1)(8))[/tex]
[tex] \tt S_{7} = \frac{7}{2}(24 + (6)(8))[/tex]
[tex] \tt S_{7} = \frac{7}{2}(24 + 48)[/tex]
[tex] \tt S_{7} = \frac{504}{2}[/tex]
[tex] \tt S_{7} = 252 [/tex]
-
Maka, jumlah batang korek api yang dibutuhkan dari pola ke-1 sampai ke 7 adalah 252
-
[tex]\purple{\boxed{\blue{\boxed{\green{\star{\orange{\ \: \: \mathcal{JK} \: \: \: {\green{\star}}}}}}}}} [/tex]