`4^(a)=5` , `5^(b)=6` ,`6^(c)=7`, `7^d=8`
find `(a times b times c times d)`

Evaluate : 6/8 times 7/3 times 4/2 times 1/5 =

Evaluate : ( a^(-4 ) times b^(-7 ) times c^(-3) times d^3 ) / ( a^(-7) times b^(-9 ) times c^3 times d^3 )

Evaluate : ( a^(-7 ) times b^(-7 ) times c^5 times d^4 ) / ( a^3 times b^(-5 ) times c^(-3 ) times d^8 )

Evaluate : a^7 times b^7 times c^(-4 ) times c^(5 ) times d^( 9 )

"(a^(-3)times b^(-2)times c^(-5)times d^(5))/(a^(4)times b times c^(-3)times d^(4))

Evaluate : a^2 times a^4 times b^5 times c^2 times b^2 times c^5

Evaluate : ( 3^-5 times a^-6 times b^-4) /( 3^-6 times a^-5 times b^-3 )

Evaluate : ( a^4 times b^5 times c^7) / ( c^8 times a^4 times b^3 )

Evaluate : ( a^4 times b^5 times c^7 )/ ( c^8 times a^4 times b^3 )