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5.	Which letter replaces the blank and completes the sequence?

Answer

Ans = N. Starting top left and moving diagonally upwards from left to right letters are repeated.

6.	Which of the smaller grids goes in the middle?

Answer

Ans = B. Staring top left and working to the right in each row, the top and third dot remain stationary, with the dot in between moving to and fro along its line 3 spaces at a time. The lowest dot moves to and fro 1 space at a time and the dot above it 2 spaces. The whole grid rotates 90deg clockwise at each step.