Q.
[tex]\huge \boxed{\sf\sum\limits^{7}_{x = 2} {(x + 9)} }[/tex]
@GengPemberantasWibu
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[tex]\huge \boxed{\sf\sum\limits^{7}_{x = 2} {(x + 9)} }[/tex]
@GengPemberantasWibu
[tex]\huge \boxed{\sf\sum\limits^{7}_{x = 2} {(x + 9)} }[/tex]
[tex]n \: = 7 - 2 + 1[/tex]
[tex]n \: = 8 - 2[/tex]
[tex]n \: = 6[/tex]
[tex]a^{1} = 2 + 9 \\a {}^{6} = 7 + 9[/tex]
[tex]a {}^{1} =11 \\a {}^{6} = 16 [/tex]
[tex]s {}^{6} = 6 \times \frac{a {}^{1} + a {}^{6}}{2} [/tex]
[tex]s {}^{6} = 6 \times \frac{11 + 16}{2} [/tex]
[tex]6 \times \frac{27}{2} [/tex]
[tex]3 \times 27[/tex]
[tex] = 81[/tex]
[tex]s {}^{6} = 81[/tex]
nb : akar ny aturan di bawah tapi saya gk pandai buat font ny
