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27 - 9 dibagi 3...
jadi beda tiap suku = 1/3
suku ke lima = 1 x 1/3 = 1/3
suku ke enam = 1/3 x 1/3 = 1/9
jadi u5 + u6
= 1/3 + 1/9
=4/9
jawab:
U5 = a.r⁵⁻¹
U5 = a.r⁴
U5 = 27. ⁴
U5 = 27.
U5 =
U5 =
U6 = a.r⁶⁻¹
U6 = a.r⁵
U6 = 27. ⁵
U6 = 27.
U6 =
U5 + U6 = +
U5 + U6 =