Question -
Answer -
(a) 24 = 2 ├Ч 3 ├Ч 4
Since 4 is composite, prime factorisation has not been done.
(b) 56 = 7 ├Ч 2 ├Ч 2 ├Ч 2
Since all the factors are prime, prime factorisation has been done.
(c) 70 = 2 ├Ч 5 ├Ч 7
Since all the factors are prime, prime factorisation has been done.
(d) 54 = 2 ├Ч 3 ├Ч 9
Since 9 is composite, prime factorisation has not been done.