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b= S2-S1 = 20-7= 13
U6 = a+5b = 7 + 5x13 = 72
kalau membantu, jadikan jawaban terbaik ya :)
S2 atau (a + U2) = 3.2² + 4.2 = 20
U2 = 20 - 7 = 13
b = U2 - a = 13 - 7 = 6
Un = a + (n - 1)b
sehingga
U6 = 7 + (6 - 1)6
= 7 + (5)6
= 7 + 30 = 37