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Question is not very clear about the context of word 'sequence' here.
If I am to select 4 numbers out of four and arrange them in order then there are 4!*8C4 = 1680 different sequences possible.
If the word sequence refers to some arithmetic sequence or geometric sequence, then counting is going to change for sure.
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What is a number in a sequence?
There are infinitely many possible number sequences, and infinitely many numbers which can appear in those sequences. Any and every number can appear in a number sequence.
How many combinations for 3 numbers?
Three numbers can be arranged in 27 different sequences if repetition is allowed, and in 6 different sequences if it's not.
What four numbers will add up to be 238?
There are infinitely many possible answers. One possible quartet is (1,1,1,235)
How many four digit numbers are possible from the digit 0'1'2'3'4 numbers may be repeated?
625 if numbers can have leading 0s, 500 otherwise.
What four numbers multiply to make 50?
There are many possible quartets: for example, 1,1,2 and 25.
