1. Four. The first three cards may all be odd (1, 3,5) or even (2,4,6). So you can draw four pictures to ensure that there are both odd and even numbers.
2.42. From A to K***, 13 cards of spades, 54- 13=4 1, which means that there may be 4 1 cards in front that are not spades, but the 42nd card must be.