hints

[sterile osprey]

We have 12 different things and we can select 5 out of 12 so now how many permutation are there which each particular thing always persent?

So here i fixed
1,2

12
So 12×11×10×9×8?

[sterile jasper]

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[jolly fern]

U mean u fixed 2 different objects out of 12 diff objects ?

In that case use string method and arrange them afterwards

[sterile osprey]

No no only one@jolly fern

Each time one thing

[jolly fern]

12c1×11c1×10c1×9c1×8c1=12×11×10×9×8 so ur correct

[sterile osprey]

+close