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Suppose 4^a=5,\ 5^b=6,\ 6^c=7,\ 7^d=8, t...

Suppose `4^a=5,\ 5^b=6,\ 6^c=7,\ 7^d=8,` then the value of `a b c d` is a. `2` b. `3/2` c. `1` d. `5/2`

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