Tell whether set a is a subset of set b. set a: whole numbers less than 10. set b: whole numbers less than 12

A is a sub set of B if and only if it has the same elements as set B which means that set B is bigger than set B
set A:{1,2,3,4,5,6,7,8,9}
set B:{1,2,3,4,5,6,7,8,9,10,11}
the answer is yes A is a subset of B