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pembuktian = suku ke3
a + (n-1) b
= 2 + (3-1) 3
= 2+ 2.3
=2+6
=8
b. rumusnya Un = 2 pangkat n + 3
pembuktian = suku ke 2
2 pangkat n + 3
= 2 pangkat 2+3
= 2 pangkat 5
= 32