Question

show that the function f: R-R:f(x)={1, if x is rational number -1, if x is irrational number} is many one into function.​

Answer 1

ʜᴏʟᴀ ᴍᴀᴛᴇ !

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⭐ᴀɴsᴡᴇʀ⭐

A number is described as rational if it can be written as a fraction (one integer divided by another integer). A number is irrational if it cannot be written as a fraction. The decimal form of an irrational number does not terminate or recur. Examples of irrational numbers are π = 3.14159