Three of the following four are alike in a certain way and so form a group.
Which one of the following does not belong to that group?
A) Rose
B) Lotus
C) Marigold
D) Petal
Rose, Lotus, and Marigold are all types of flowers. Petal, however, is a part of a flower, not a type of flower.
Thus, Petal does not belong to the group. When grouping items, identify the common characteristic shared by most and check for the odd one out based on that characteristic.
What comes next in the series?
\(2, 6, 12, 20, 30, \ ?\)