In this series,
WO , CJ , HF , MC , RA
Place value of first letter of first term increased by 5 in each term where as the place value of second letter decreased by 5,4,3,2 ....
That is
WO - Place value of W= 23 adding 5 to this we get the first letter of the next term that is C
Place value of O = 15 subtracting 5 we get place value of Second letter of the next term that is J
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