Question

A-1
Determine the number of three digit number the product of whose digit is prime​

Answer 1

Answer:

The only such numbers possible are one having two 1’s in them because prime number is only divided by 1 and number itself.

3,5,7 are only 3 numbers which are prime.

So 3*3=9 possible numbers are possible.

113

115

117

131

151

171

311

511

711.