Exact form :
1
_______
600000
Decimal form :
-
1. 6 . 10 ^ -6.
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Answer:
266.
Step-by-step explanation:
You want to take 285, and add 127 to that. You get 412. Subtract 146, and you get 266.
Let the difference between consecutive terms be D. If the middle term is 30, then the term before it is 30-D, and the term after it is 30+D. So the sum of these three terms would be (30-D) + 30 + (30+D) = 3*30.
Extending this sum to include all 11 terms centered around 30, we see that any addition of D is canceled by a balanced subtraction, leaving you with 11 copies of 30. So the value of the sum is 11*30 = 330.
