What number should replace the question mark? Going clockwise from the top, the numbers are 56, 114, 232, 470, 948, 1906, 3824, ? 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.
What number should replace the question mark? The left group has top numbers 4, 19 and bottom numbers 4, 16 and gives 12. The right group has top numbers 6, 7 and bottom numbers 3, 4 and gives ?. Answer with a natural number.
What number should replace the question mark? Each group has two top numbers and two bottom numbers and a result: top 4, 12 and bottom 8, 4 gives 64; top 3, 9 and bottom 3, 12 gives 216; top 20, 9 and bottom 6, 2 gives ?. Answer with a natural number.