(1) All letters from A to Z areassigned respective numbers from1 to 26. In the given series, theletters get replaced by its next letterand number after the letters isobtained by multiplying theassigned values of letters. Forexample, AN is followed by 1 × 14 =14, BO is followed by 2 × 15 = 30;similarly, missing term = FS,followed by 6 × 19 = FS114.