13. Write the largest 4-digit number and give its prime factorisation.
14. 13 and 31 are two prime numbers having the same di

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

Emma · Answer

Answer:      Step-by-step explanation:   Let the number be x   Then,   ⇔x+25x=455⇔75x=455⇔x=(455×57)⇔x=325

Arya

FACTORISE

1. 27-125a³-135a+225a²
2. 64a³-27b³-144a²b+108 ab²2

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Which is a 4-digit number where the first digit is one half the last digit, the second digit is the first digit doubled, and the t

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13. Write the largest 4-digit number and give its prime factorisation.14. 13 and 31 are two prime numbers having the same di