പൂരിപ്പിക്കുക. 2, 5, 9, 14, 20, _____ ?
A27
B18
C28
D14
A27
B18
C28
D14
Related Questions:
Refer to the given letter-cluster series and answer the question that follows.
AKMG, RTDC, WQCT, PILE, VTXF, HRXW
If in each of the letter-clusters, each letter is changed to the next letter in the English alphabetical order, how many letter-clusters thus formed will have exactly two vowels?