Question

Find the n if condition given nC5= 30 x nC3 ​

Answer 1

Answer:

n!/n-5!=30 n!/n-3!

1=30 1/(n-3)(n-4)

n^2 -7n+12=30

n^2 -7n-18=0

n^2 -2n+9n-18=0

n(n-2)+9(n-2)=0

n=2orn=-9 but -9 not possible

so n=2

Answer 2

Step-by-step explanation:

see answer in above picture