Find the HCF of the numbers in the following, using the division method.

$391, 425, 527$

Find the HCF of the numbers in the following, using the division method.

$1794, 2346, 4761$

Show that the following pair is co-prime.

$59, 97$

Show that the following pair is co-prime.

$161, 192$

Show that the following pair is co-prime.

$343, 432$

Show that the following pair is co-prime.

$512, 945$

Show that the following pair is co-prime.

$385, 621$

Show that the following pair is co-prime.

$847, 1014$