MBA Exam

There are 6 tasks and 6 persons.Task1 can not be assigned either to person1 or person2;task 2 must be assigned either to person3 or person4.Every person must be assigned one task.In how many ways can the assignment be done..??[CAT06]

1) 124
2) 144
3) 216
4) 164

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MBA Other Question
What is the remainder when 2512.2513.2514.2515 + (2516)^3 + (2517)^4 is divided by 9?

1) 0
2) 1
3) 3
4) 5
 how we fine a smallest no..when divided bu 3,7,and 11 gives remainder..2,1,2...respetevly.i got answer bt i want a proper mathod...