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u 5 → a + 4b = 21 _
5b = 20
b = 20/5
b = 4
subtitusikan
a + 4b = 21
a = 21 - 4b
= 21 - 4(4)
= 21 - 16
= 5
suku ke 50
Un = a + (n-1)b
= 5 + (50-1) 4
= 5 + (49)4
= 5 + 196
= 201
jawabannnya B