MBA Exam

there are 5 different boxes and 7 different balls.all the 7 balls are to be distributed in 5 boxes placed in a row so that any box can recieve any number of balls a.)if balls are identical how many ways can all the balls be distributed in boxes b.)suppose all boxes and balls are identical ,then in how many ways these balls can be distributedpls explain ur answers

1) 110,12
2) 330,13
3) 220,19
4) 440,16

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MBA Other Question
Let m = 12/1 + 22/3 + 32/5 + ... + 5002/999, and n = 12/3 + 22/5 + 32/7 + ... + 5002/1001, then the integer closest to m - n is

1) 250
2) 500
3) 1000
4) 1500
 Harry, a milkman, buys pure milk and adds some water in it before selling. He sells the mixture ata price 10% less than the price of pure milk and makes a profit of 10%. Find the quantity (in litres)of water that he adds to every two litres of pure milk.Please explain this one

1) 4/9
2) 2/3
3) 2/9
4) None of these