Lifeline

A limited power or hint a contestant can use on the game show Who Wants to be a Millionaire? in order to more easily answer a question

Jimmey Kimmel recommends against using the lifeline “Ask the Host” while he is hosting Who Wants to be a Millionaire as he fears he would be ineffectual.

series

A summation of infinitely many things

The series 9/10 + 9/100 + 9/1000 + 9/10000 + ... = 1, so 0.999... repeating equals 1.

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