Because there are 7 letters that don't repeat, 7X6X5X4=840 combinations. To give you an idea of how to solve the problem, if there had been 9 letters and you wanted to make combinations of 3 letters, you would multiply: 9X8X7=504
You could consult the Online Encyclopedia of Integer Sequences, but it does not have this sequence. http://www.research.att.com/~njas/sequences/ Note: the mathematical term "series" refers to a sum. The series is 3 + 16 + 6 +... In mathematics, a list of numbers like that is referred to as a "sequence." Also, while your question does not explicity state this, the meaning of your sentence should be "what is the next most likely number..." as many different sequences start out with the same terms. Try checking 1,2,3, at the OEIS, and you'll see a large number of possibilities for the 4th term. However, to address your particular sequence, here's a technique that is sometimes used: Consider the following two sequences: 1,2,3,4,5,6,7... 5,10,15,20,25,... Now consider the sequence 1,5,2,10,3,15,4,20,... If you work your sequence backwards, you'll see that this technique will lead to a possible answer.
3 Each term is divided by 3 to produce the following term.
5
The answer is 26*26*26*10*10*10 = 17,576,000
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Next three letters are: e n d
The letters represent the initials of the months: January, February, March, etc. That being so, the next 3 letters would be SON (Sept, Oct, Nov).
tricky 1?? Not so tricky, they are the first letters of the months of the year, so the next letters would be, S, O, and N
146.6.
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14 Ten = 3 Letters Four = 4 Letters Three = 5 Letters Eleven = 6 Letters Fifteen = 7 Letters Fourteen = 8 Letters
Those letters can be used to spell "waiting for you".
Because there are 7 letters that don't repeat, 7X6X5X4=840 combinations. To give you an idea of how to solve the problem, if there had been 9 letters and you wanted to make combinations of 3 letters, you would multiply: 9X8X7=504
the next number is 3, then the next is 6 and the next is 6 the numbers coorespond with how many letters in the word yes that doesn't make sense but here lol eg. the first number = 3 so one=3 because there is three letters and so on
12 memory sequences