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u2 = a + b = 7 -
4b = 16
b = 4
u2 = a + b = 7
a + 4 = 7
a = 3
u40 = ... ?
a + 39b
= 3 + (39)4
=159
atau bisa juga pakai rumus
u40 = a + (n-1)b
haha semoga bisa membantu