Combination of Atleast One Thing from n Things When All Are Not Different

Q. The number of divisors of 9600 including 1 and 9600 are

1. 60
2. 58
3. 48
4. 46

Q. If seven-digit number made up of all distinct digits $8,7,6,4,2,x$ and $y$ is divisble by $3$, then

1. Maximum value of $x-y$ is $9$
2. maximum value of $x+y$ is $12$
3. $\sum (x+y)=60$
4. minimum value of $x-y$ is $3$

Q. Total number of $4$ digit numbers that can be formed using the digits $1,2,5,6,7$ and that are divisible by $4$ is