a. A number is divisible by 3 if the sum of all digits is divisible by _.
b. A number is divisible by _ if the number is divisible by both 2 and 3.
c. A number is divisible by 9 if the _. of all the digits is divisible or a multiple of 9.
d. If the sum is 53 by what divisibility is this?
e. If the given number is 26 is this divisible by 2 and 3?​