88 of them.
The 2-digit multiples of 11 all have identical digits.
If a number is divisible by 2 (an even number) and 3 (the sum of the digits is divisible by 3) then the number is divisible by 6.
-5
multiples of 2: 2, 4, 6, 8. 10 number of spade with multiples of 2........... 5 number of heart with multiples of 2 ............5 number of diamond with multiples of 2........5 number of spade with multiples of 2 ...........5 =============================== total number of cards with multiple of 2.....20 cards
2 digits are in 30
ALL such numbers will be multiples of 9.
2
2
2 - the 2 and the 6.
2 of them.
There are 2 significant digits: 5 and 4