(1) The following digit in the units column makes 6380_ divisible by 5
The last digit has to be a 0 or a 5 for divisibility by 5. 5 is not one of the options but 0 is (ii)
(2) 7848 is divisible by ____
7848 is definitely not divisible by 5 but is divisible by 1, 6 and 8. So we have 3 options that we can eliminate by evaluating the other statements to see which fits best.
(3) The HCF of 42 and 240 is ___
The factors of 42 are 1, 2, 3, 6, 7, 21 and 42.
The factors of 240 are 1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, and so on.. 42 is not one of them.
Therefore the highest common factor is 6.
(4) Divide the 16th multiple of 4 by the 8th multiple of 8
16th multiple of 4 is 64. The eight multiple of 8 is also 64. Therefore the answer is 1.
Option (C) (1) - (ii), (2) - (i), (3) - (iv), (4) - (iii) is the correct answer.