Which of the following is a rational number 2n, 6/0, /61, or 0.37815?

The rational number among the given options is 0.37815.

A rational number is a number that can be expressed as a fraction, where the numerator and denominator are both integers.

Out of the options given, 0.37815 can be expressed as a rational number.

To confirm, we can write 0.37815 as a fraction:

0.37815 = 37815/100000

Both the numerator (37815) and the denominator (100000) are integers, so 0.37815 is a rational number.