A1 C3 F6 J10 O15 ........

Logial Reasoning (CLAT) logical alphabets

Directions : Study the sequence/pattern of letters or numbers carefully to work out the pattern on which it is based, and answer what the next item in the sequence must be. For example, the sequence 'A, C, E, G, ?' has odd numbered letters of alphabet; therefore, the next item must be 'I'.

A1, C3, F6, J10, O15, ?.

U21

V21

T20

U20

Explanation:

A      1,
b           2
C        3,
de           4,5
F    6,
ghi        7,8,9
J            10,
klmn    11,12,13,14
O         15.
Hence, option 1 is the correct answer.