self Maths Puzzle

In a room there are 7 persons.The chance that two of them are born on the same day of the week is
A)1080/7^5
B)2160/7^5
C)540/7^4
D)None of these

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self Other Question

5,7,19,21,41,__,__ how many 4 digit numbers divisible by 5 can be formed with digits 0,1,2,3,4,5,6 and 6?