Evaluate:

(i)

(ii)

(iii)

(iv)

(i)

_{We have,}

=

Now by prime factorization method,

=

=

(ii)

_{We have,}

= =

Now by prime factorization method,

=

=

(iii)

_{We have,}

=

Now by prime factorization method,

=

=

(iv)

_{We have,}

=

Now by prime factorization method,

=