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There are: 7C6 = 7

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Q: How many combinations are there if there are seven numbers and you have to have a six number combination?

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There is 1 combination of all ten numbers, 10 combinations of one number and of nine numbers, 45 combinations of two or eight numbers, 120 combinations of three or seven numbers, 210 combinations of four or six numbers and 252 combinations of five numbers. That is 1023 = 210 - 1 in total.

8x7x6x5x4x3x2 or 40320 * * * * * That is totally incorrect. There are only 8 combinations: one with each of the 8 numbers missing. In a combination the order does not matter so 1234567 is the same as 1236547 or 7643125 etc.

8

Yes.

510510

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There are 7 combinations. Each combination excludes a different one of the seven numbers.

There is 1 combination of all ten numbers, 10 combinations of one number and of nine numbers, 45 combinations of two or eight numbers, 120 combinations of three or seven numbers, 210 combinations of four or six numbers and 252 combinations of five numbers. That is 1023 = 210 - 1 in total.

The number of combinations of six numbers that can be made from seven numbers will depend on if you can repeat numbers. In all there are over 2,000 different numbers that can be made.

8x7x6x5x4x3x2 or 40320 * * * * * That is totally incorrect. There are only 8 combinations: one with each of the 8 numbers missing. In a combination the order does not matter so 1234567 is the same as 1236547 or 7643125 etc.

Start with the factors. Multiply combinations of three prime factors, then combinations of five, then seven, etc. All generated numbers will be guaranteed to have an odd number of prime factors.

There is only one combination. There are many permutations, though.

Revise your question, it makes no sence.

Because every combination is equally probable, but more combinations sum to seven than to any other total. There are 36 possible combinations; of these seven will produce 7, only one will give 2 and only one will give 12.

8

Yes seven is a prime number and the only numbers that will go in to seven is one and seven.

any 4 from 7 is 35, in any order is 35 x 24 ie 840

There is an infinite number of numbers that are not divisible by seven!

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