Number Ruby

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  4. Check whether a number is finite or infinite with the finite and infinite
0.0.finite? # => true
(-1.0/0.0).finite? # => false
(+1.0/0.0).finite? # => false
0.0.infinite? # => nil
(-1.0/0.0).infinite? # => -1
(+1.0/0.0).infinite? # => 1