How many matrices can be obtained by using one or more numbers from four given numbers

How many different products can be obtained by multiplying two or more of the numbers 3,5,7,11 (without repetition)?

How many different products can be obtained by multiplying two or more of the numbers 2,5,6,7,9?

How many different products can be obtained by multiplying two or more of the numbers 3, 5,7, 11 (without repetition)?

How many different products can be obtained by multiplying two or more of the numbers 2, 5, 6, 7, 9 (without repitition)?

How many hamispheres can be obtained from a given sphere?

How many types of matrices can be formed from 8 elements ?

How many types of matrices can be formed from 11 elements ?

How many three digit numbers can be formed using the digits from 1 to 5 ?

1, 2, 3, 4 are four numbers. How many numbers can be made using all four numbers without repetition?

1, 2, 3, 4 are four numbers. How many numbers can be made using all four numbers without repetition?