# 美味的吃食美食指南，柠檬冰银丹草明晶草莓

strawberry~strawberry~

Today my friends and I went to a strawberry picking farm.

# Problem

MMM got a big big big cake, and invited all her M friends to eat the cake together. Surprisingly one of her friends HZ took some (N) strawberries which MMM likes very much to decorate the cake (of course they also eat strawberries, not just for decoration). HZ is in charge of the decoration, and he thinks that it's not a big deal that he put the strawberries on the cake randomly one by one. After that, MMM would cut the cake into M pieces of sector with equal size and shape (the last one came to the party will have no cake to eat), and choose one piece first. MMM wants to know the probability that she can get all N strawberries, can you help her? As the cake is so big, all strawberries on it could be treat as points.

Lemon ice & minty strawberries 柠檬冰薄荷草莓Lemon ice & minty strawberries 柠檬冰薄荷草莓 Cook 0 mins；Prep 30 mins；Vegetarian；Freezable Nutrition per serving 174 kcalories, protein 1.0g, carbohyd

食材清单

strawberry~

First we went on the car to go to the strawberry picking farm. Yuexi went on my car and Anna went on her own car.

# Input

First line is the integer T, which means there are T cases.

For each case, two integers M, N indicate the number of her friends and the number of strawberry.

(2 < M, N <= 20, T <= 400)

Lemon ice & minty strawberries 柠檬冰薄荷草莓

for bases | sugar 55g |

butter 55g | egg 1 |

ground almond 55g | for top |

heavy cream 250ml | strawberry 切半 200g |

for filling | heavy cream 120ml |

cream cheese 600g | fresh cream 200g |

strawberry 200g | sugar 100g |

Next we went on the tracker to the field and picked strawberries, there were also lots of strawberries.

# Output

As the probability could be very small, you should output the probability in the form of a fraction in lowest terms. For each case, output the probability in a single line. Please see the sample for more details.

烹饪步骤

Then we ate some of the strawberries and picked some more strawberries, some of the strawberries were very very ripe.

# Sample Input

2

3 3

3 4

Cook 0 mins；Prep 30 mins；Vegetarian；Freezable

步骤1