List all the primes between 20 and 40 in increasing order (in the form 2,3,5,7,9,11). A/

How many six-digit even numbers more than 200,000 can be formed using all of the digits 1, 1, 2, 2, 3, 5? (e.g. 221135, 315122, 21135, etc.)

2. Factor 10+1 into a product of primes for k= 1, 2, 3, 4, 5.

Serial numbers for a product are to be made using 4 letters followed by 2 digits.The letters are to be taken from the first 9 letters of the alphabet, with no repeats.The digits are taken from the 10 digits (0, 1, 2,...,9), with no repeats.How many serial number can be generated?