1)=8/13*1/4=2/13
2)=4/5*1/3=4/15
3)=15/7*1/5=3/7
4)= 21/16*1/7=3/16
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1)=8/13*1/4=2/13
2)=4/5*1/3=4/15
3)=15/7*1/5=3/7
4)= 21/16*1/7=3/16