Answer :
0.684 and 0.1222... both decimals represent rational numbers.
What are rational numbers?
A rational number is a number that is expressed as the ratio of two integers, where the denominator should not be equal to zero.
0.684 is a terminating number, thus rational.
0.1222... is a non terminating repeating decimal, thus rational.
2.71828182845904523536... and 3.141592653589793238... are non terminating, non repeating decimals, thus irrational.
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