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karena dari 5 ke 12 = 7
12 ke 21 = 9
21 ke 32 = 11
maka dri 32 pasti beda 13, dan dri itu beda 15.
semoga membantu :)
U2 = 12
U3 = 21
U4 = 32
Un = n × (n + 4)
U5 = 5 × (5 + 4)
= 5 x 9
= 45
U6 = 6 x (6 + 4)
= 6 x 10
= 60
Semoga membantu