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a. 6/10 dan 2/5
= 6/10 , (2/5) × (2/2)
= 6/10 , 4/10
berarti 6/10 > 2/5 (a salah)
b. 4/15 dan 2/5
= 4/15 , (2/5) × (3/3)
= 4/15 , 6/15
berarti 4/15 < 2/5 (b benar)
c. 21/35 dan 2/5
= 21/35 , (2/5) × (7/7)
= 21/35 , 14/35
berarti 21/35 > 2/5 (c salah)
d. 24/45 dan 2/5
= 24/45 , (2/5) × (9/9)
= 24/45 , 18/45
berarti 24/45 > 2/5 (d salah)
jadi, jawabannya adalah b
semoga membantu