Express the indicated degree of likelihood as a probability value. "it will definitely get dark tonight."

The indicated degree of likelihood as a probability value. "It will definitely get dark tonight." is:

                                    1

We know that in general the indicated degree of likelihood as a probability value lie between 0 and 1.

( For example-- The event of getting 7 when rolling a six-number cube.

As we know that the possible outcome on rolling a six-sided die is:

{1,2,3,4,5,6}

Hence P(getting 7)=0

( as none of the outcome is 7)  )

( i.e. P( getting a head or a tail on tossing a coin)=1

( since there are just two outcomes on tossing a coin i.e. head and tail will come up )

Here we have a outcome as:

"It will definitely get dark tonight."

It is a obvious event that it gets dark at night there is no other possibility.

               Hence, the answer is:

                          1

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