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The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3. Find such pairs of prime numbers upto 100.

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Q. Which of the following pairs are always co-primes?

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(ii) one prime and one composite number
(iii) two composite numbers

Question 3

The numbers 13 and 31 are prime numbers. Both these numbers have same digits 1 and 3. Find such pairs of prime numbers up to 100.

Thenumbers 13 and 31 are prime numbers. Both these numbers have samedigits 1 and 3. Find such pairs of prime numbers up to 100.

Q. A three-digit prime number is such that the digit in the unit place is equal to the sum of the other two, and if the other digits are interchanged, we still have a prime number of three digits. Then the total number of such primes is:

Q. Consider digits

1, 2, 3, 4, 5, 6

7

. Using these digits, numbers of five digits are formed. Then, probability of these such five digit numbers that have odd digits at their both ends only, is(repetition not allowed)

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