6 : 12 : : 20 : ?

From the given alternatives select the word which cannot be formed using the letters of the given word
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Direction: In the following question, select the related letters from the given alternatives. 

PAL : LAP :: PAN : ? 

From point A, Ram moves 100m in north­east direction, he again turns and moves 100m in south­east direction. He again turns and covers 100m southwest and finally covers 100m in north­west direction. In which direction is he now with respect to A?

Select the correct option that will fill in the blank and complete the series.
3, 9, 36, 180, ?

If 14 # 13 = 1 and 27 # 36 = 0, then 46 # 31 = ?

Complete the following series.
12, 8, 14, 6, 16, ?

Radhy is 7 ranks ahead of Sumit in a class of 39. If Sumit’s rank is seventeenth from the last, what is Radhy’s rank from the start?