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pembahasan SMA IPA--p4tkmatematika-org

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19. Diketahui barisan aritmetika dengan Un adalah suku ke-n. Jika U2 + U15 + U40 = 165,<br />

maka U19 = … .<br />

A. 10<br />

B. 19<br />

C. 28,5<br />

D. 55<br />

E. 82,5<br />

Penyelesaian:<br />

U15 =<br />

U40 =<br />

U2 =<br />

U2 + U15 + U40 = 165<br />

U19 =<br />

= 55

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