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Barisan geometri lagi ne..?
diketahui suatu barisan geometri dengan U1 = 16 dan U2= 24. nilai U5 adalah...
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- 8 years agoFavorite Answer
Un = arⁿ⁻¹
~karena r belum diketahui, cari r:
r = Un/Un₋₁
..= U₂ / U₂₋₁
..= U₂ / U₁
..= 24/16
r = 3/2
~ Cari U₅
Un = arⁿ⁻¹
U₅ = ar⁵⁻¹
.... = ar⁴ ---> a = U₁ = 16
.... = 16*(3/2)⁴
.... = 16*3⁴ /2⁴
.... = 16*81/16
U₅ = 81
jawabannya 81
semoga membantu =)))
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