Question

Pls solve No. 10
It is from the chapter Permutation and combination

Answer 1

total no. of stations=20
we have to select stations=2

so we will use permutation
now 20P2=20/20-2
=20*19=380
so total tickets to be printed=380
so ✓ answer is option e

Answer 2

8. C. 30

9. A. 165

10. E. 380