4a=5,5b=6,6c=7 or 7d=8 so (a×b×c×d)=
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4a=5,5b=6,6c=7 or 7d=8
a=5÷4
=1.25
b=6÷5
=1.2
c=7÷6
=1.166666667
d=8÷7
=1.142857143
Now, (a×b×c×d)=(1.25×1.2×1.166666667×1.142857143)=2
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