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alexgriva [62]
3 years ago
9

Why can the electric force be either attractive or repulsive?

Mathematics
1 answer:
nika2105 [10]3 years ago
6 0

Answer:

A

Step-by-step explanation:

(So the question doesn’t get removed)

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How many different seven-letter sequences can be formed from the letters a, a, a, a, a, b, c?
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If b is in the first position then c can be in any 1 of the remaining 6 positions.

If we start with ab then the letter c can be in any one of 5 positions and  if we have aab there are 4 possible positions for c and so on.

So the total number of possible sequences where b comes first = 6+5+4+3+2+1 =  21.

The same argument applies when c comes before b  so that gives us 21 ways also.

So the answer is 2 *21 = 42 different sequences.

A more direct way of doing  this  is to use factorials:-

answer = 7! / 5!     =  7 * 6 = 42.

 ( We divide by 5!   because of the 5 a's.)

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