self Maths Puzzle

how many 4 digit numbers of the form pqrs are there with p

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self Other Question
On Jan 1st I put 1 rupee in bank on 2nd I put 2 on third I put 4 and it goes so on.By the end of the same month I would have come up to a particular amount.On which day I would have obtained the half of the amount ? 1(1!)+2(2!)+3(3!)+4(4!)+5(5!)+..........................................100(100!) if it is divided by 42 then what is the remainder?