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Verified answer
Barisan dan DeretDiketahui:
S4 = 38
n = 4
Ditanya:
U1 + U4 = ?
Jawab:
Sn = n/2 (U1 + Un)
S4 = n/2 (U1 + U4)
38 = 4/2 (U1 + U4)
38 = 2 (U1 + U4)
38/2 = U1 + U4
U1 + U4 = 19
*semoga membantu. sukses selalu ^_^