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Verified answer
Un = a + (n-1)bU3 = a + 2b = 13
U16 = a + 15b = 78
Eliminasi
a + 2b = 13
a + 15b = 78
------------------ -
-13b = -65
b = (-65) / (-13)
b = 5
a + 2b = 13
a + 2(5) = 13
a + 10 = 13
a = 13 - 10
a = 3
maka suku pertama adalah 3 dan beda adalah 5