Question

Which of the following decimal expansion cannot be a rational number

A) 0.697
B) 0.45 (bar in 5)
C) 0.3789 (bar 3789)
D) 0.87658217

ANSWER)
B is correct

An i right or wrong

Answer 1

any repeating decimal is a rational number.

0.45 = 0.4 + 0.0555555.
= 4/10 + 5/90
= 41/90

All of the above decimals are rational, since they either repeat or terminate.