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3. Find the G.C.D of each of the following pairs:
(a)
2
3
x
3
2
x
5
x
7
and
2
2
x
3
2
=
x
(b)
2
4
x
3
3
x
5
2
and
2
3
x
3
x
5
2
x
7
=
x
x
(c)
2
2
x
3
2
x
3
and
2
4
x
3
7
x
11
2
x
5
2
=
x
x