Problems on HCF and LCM - General Aptitude

Q1:

Reduce 128352 to its lowest terms.
238368

A
3
4

B
5
13

C
7
13

D
9
13

ANS:C -

7
13

128352) 238368 ( 1 128352 --------------- 110016 ) 128352 ( 1 110016 -