Text Solution `(3)/(7)``(2)/(7)``(5)/(7)``(1)/(7)` Answer : A Solution : A leap year consists of 366 days, i.e., 52 full weeks and two extra days. These two extra days can be any one of the following possible outcomes, <br> (i) Monday and Tuesday <br> (ii) Tuesday and Wednesday <br> (iii) Wednesday and Thursday <br> (iv) Thursday and Friday <br> (v) Friday and Saturday <br> (vi) Saturday and Sunday <br> (vii) Sunday and Monday. <br> Let A and B be the events that a leap year contains 53 Thursday and 53 Friday, respectively. Then, <br> `P(A)=(2)/(7),P(B)=(2)/(7)` and `P(A nn B)=(1)/(7)` <br> `therefore` Required probability is given by <br> `P(A uu B) = P(A)+P(B)-P(A nn B)` <br> `=(2)/(7)+(2)/(7)-(1)/(7)=(3)/(7)`
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