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In four schools B1, B2, B3, B4 the perce...

In four schools `B_1, B_2, B_3, B_4` the percentage of girls students is 12, 20, 13, 17 respectively. From a school selected at random, one student is picked up at random and it is found that the student is a girl. The probability that the school selected is `B_2`, is

A

a) 6/31

B

b) 10/31

C

c) 13/62

D

d) 17/62

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