All the girls are sitting together.

1/42
41/42
3/35
1/42

Correct Answer: 1/42

Explanation:

We have, 5 boys and 5 girls.
Since, all the girls are sitting together, we consider them as one. Now, we can arrange 5 boys and 1 girl in 6! ways and these 5 girls (whom we considered as one) can also be arranged in 5! ways.
∴ Favorable number of ways = 6!5!
and total number of ways to arrange 5 boys and 5 girls = 10!
∴ Required probability 6!5!/10! = 1/42

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