What is the mathematical pattern for 1 2 5...?

Answer 1

There is not enough information to answer the question.

The pattern could be

1 (+1) = 2 (+3) = 5 (+5) = 10 ... where the differences are the odd integers,

or

1 (+1) = 2 (+3) = 5 (+6) = 11 ... where the differences are the triangular numbers,

or

1 (+1) = 2 (+3) = 5 (+9) = 14 ... where the differences are powers of 3,

or many, many other possibilities.

Answer 2

Write the decimal part of the num 74.63