Select the Venn diagram that best illustrates the

If 21 @ 7 = 18 and 43 @ 22 = 68, then 48 @ 49 = '?'.

Select the option in which the numbers are NOT related in the same way as are the numbers of the following set.

(22, 31, 45)

(54, 75, 105)

Select the option that is related to the third term in the same way as the second term is related to the first term.

Complete the analogy.

81 : 45 :: 72 : ?

Select the combination of numbers that when placed sequentially in the blanks of the given series will complete the series.

MATTER : VIXXEQ :: ORDER : ?

Select the option that is related to third letter cluster in the same way second letter cluster is related to first letter cluster.