4a=5, 5b=6, 6c=7 7d=8 find (a×b×c×d)
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a=5/4
b=6/5
c=7/6
d=8/7
so a×b×c×d=5/4×6/5×7/6×8/7
=8/4
=2
b=6/5
c=7/6
d=8/7
so a×b×c×d=5/4×6/5×7/6×8/7
=8/4
=2
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