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Un = a+ (n-1). b
. = 3 + 19 . 2
= 3 + 38
= 41
u5=11
u5=3+(n-1)b
=3+4b=11
=4b=8
=b=2
sn20=20/2(2×3+(n-1)×2)
=20/2(6+19×2)
=10×44
=440
Maaf kalau salah