Directions: Study the sequence/ pattern of letters or number carefully to work out the pattern on which it is based - and answer what the next item in the sequence must be. A1 - C3 - F6 - J10 - O15?

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Directions: Study the sequence/ pattern of letters or number carefully to work out the pattern on which it is based - and answer what the next item in the sequence must be. A1 - C3 - F6 - J10 - O15?