Choose the correct alternative for the missing term in the series: $3F, 6G, 11I, 18L, ?$

Fill in the blank space for the given series with the correct alternative.
$1, 2, 3, 5, 8, (\ldots)$

Fill in the blank space for the given series with the correct alternative: $2, 6, 12, 20, 30, ?$

Study the following arrangement carefully and answer the question given below:
$B, 2, I, J, K, 4, 3, H, 5, E, R, P, 6, N, A, 9, W, 8, T, U, 1, V, D, 7, F$
Four of the following five are alike in a certain way and so form a group based on their positions in the given arrangement. Which is the one that does not belong to this group?

Choose the correct alternative to complete the series: $ab . . aa . . caab . . . c . abb . . . c$

Choose the correct alternative to complete the series: $...aba...cabc...dcba...bab...a$