The telephone numbers in a small town have two digits. They run from 00 to 99.
Of the 100 possible numbers, those that
become smaller when reversed are not
used, i. e. 21 is not used. What is the
maximum number of telephone
numbers this town could have?

312312

step-by-step explanation:

168

step-by-step explanation:

i am pretty sure that the answer is 168

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d