What number should replace the question mark? Each circle has six segments, listed as top-left, top-right, left, right, bottom-left, bottom-right: 4, 2, 6, 1, 5, 3; 5, 4, 2, 6, 4, 3; 3, 7, 4, 5, 2, ?. Answer with a natural number.
What number should replace the question mark? Each group has a top number, a left number, a right number and a bottom number, and a centre number: top 7, left 24, right 6, bottom 9 gives 28; top 14, left 9, right 8, bottom 4 gives 27; top 16, left 9, right 10, bottom 11 gives ?. Answer with a natural number.
What number should replace the question mark? Each group has two top numbers, a number in the middle and a number below: top 11, 14 with 128 and 26; top 9, 16 with 126 and 18; top 17, 8 with ? and 11. Answer with a natural number.
Each line and symbol in the four outer circles is transferred to the centre circle by the rules: appearing once, it is transferred; twice, it is possibly transferred; three times, it is transferred; four times, it is not transferred. Which circle A to E should be at the centre? Choose from the options labelled in the figure.