A website Maths Puzzle Logical Reasoning

If 4^a=5 5^b=6 6^c=7 7^d=8 Then find the value of abcd

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A website Other Question

what is the value of this expression (1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*........*(1-1/99)
Complete this 6 letter word:
_ o _ e _ h

Clue:
1. Girls love it.
2. Boys use it.
3. Parents hate it.
4. Animals are scared of it