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There are two vans each having numbered seats, 3 in the front and 4 at the back. There are 3 girls and 9 boys

There are two vans each having numbered seats, 3 in the front and 4 at the back. There are 3 girls and 9 boys to be seated in the vans. The probability of 3 girls sitting together in a back row on adjacent seats, is 1 13 (a) (b) 1 39 (c) 1 65 (d) 1 91

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