Which number is divisible by 2 and 9

so 18 is the number which is divisible by 2 and 9

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.

it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.