the number of 2digit prime numbers those can be formed in Which Both digits are prime numbers. is 1 2 3 or 4?

Question

The sum of all the digits of the number obtained By adding the First six multiples of 6 is 

7.8.9.10

 

Answer 1

Hello Wangdi,

 

I am not sure if I understand your question(s) correctly.

 

As far as prime numbers are concerned the possibilities are 23, 37,53 and 73 so there are 4, two digit prime numbers where both digits are prime. Prime Numbers like 11, 13 are eliminated since 1 is not prime and so are prime numbers like 43,47 since 4 is not prime and so on.

 

The first 6 multiples of 6 are 6,12,18,24,30,36. When they are "added" we get 126. The digits are 1,2,6. Their sum is 1+2+6 =9.

 

Hope this helps ,

 

Wishing you the best in your academic endeavors.

 

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Thanks

Pradip