Question

13. Write the largest 4-digit number and give its prime factorisation.
14. 13 and 31 are two prime numbers having the same digits 1 and 3. Find such other pair of numbers up to 100.-
15. Find the number having the following prime factors.
(a) 7 x 13 x 17 x 23 (b) 2 x 2 x 2 x 2 x 3 x 5 x 7 x 13
(c) 3 x 7 x 11 x 13​

Answer 1

Answer:

Step-by-step explanation:

Let the number be x

Then,

⇔x+25x=455⇔75x=455⇔x=(455×57)⇔x=325