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what is the arithmethic mean between -1 and 9​

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BORGARSHHHTIN

Step-by-step explanation:

FORMULA OF ARITHMETIC SEQUENCE

an = a1 + (n - 1) d

9 = -1 + (5 - 1) d

9 = -1 + (4) d

8 = 4d

2 = d

  • Therefore, the arithmetic mean between -1 and 9 is 2d.

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