Answer:
He will need to work a minimum of 5 weeks
Step-by-step explanation:
1,200-400=800
800 divded by 160=5
To give a brainliest after someone answers or multiple people answer there is a button near it that says pick as brainliest which gives that person a gold crown...sorry i dont know what each of this symbols.mean hope this help though
It follows from the definition of the binomial coefficient:

So we have

That is,
gets absorbed into the numerator's factorial, and we introduct
into the denominator. Now,
, so we get

as required.
Answer:
I think that the answer is 2 power n , so A is the correct choice .