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2. un=a+(n-1)×b
=1+(25-1)×2
=1+24×2
=1+48
=49=d
3.un=a+(n-1)×b
=12+(60-1)×8
=12+59×8
=12+472
=484=b
#semogamembantu
U3 = 4×3 - 2
U3 = 10
berarti jawaban yg benar yaitu D. 4n - 2
2. Un = a + (n-1) b
U25 = 1 + (25-1) 2
U25 = 49
jawabannya D. 49
3. U60 = 12 + (60-1) 8
U60 = 484
jawabannya B. 484