1 one infinity divided by infinity

As difficult as it is to understand, Infinity minus 1 is still Infinity.

74 1/infinity

or

(74*infinity + 1)/infinity

"Infinity + 1" is meaningless both mathematically and philosophically.

1 time infinity equals infinity. Infinite divided by infinite equals 1. There's your answer.

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Except that it is not true. 1 times infinity is, indeed, infinity. But infinity divided by infinity need not be 1. See for example, the paradox of Hibert's Hotel at the attached link.