Find the fourth proportion of (k + 3), (2k - 6), and (4k -

7, 26, 238, 962, 8522, 34078

14      42       105       210      315      ?

8      24       48      144      ?     864

Find sum of first n terms: 2 + 6 + 12 + 20 + 30 + …

6              3              24           218         3486       43575

Which of the following is true about the relation between the wrong numbers in the following series?

I: 10, 18, 29, 40, 54, 70

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

4 7 6

15 ? 21

44 68 60

100     221     77     245     50    275

22      39       58       81      ?        141