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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret
b = (U6 - U2)/(6 - 2)
b = (23 - 7)/4
b = 16/4
b = 4
U40 = U6 + 34b
U40 = 23 + 34 . 4
U40 = 23 + 136
U40 = 159