Question

Question is attached​

Answer 1

A1= a•r=1•3=3
A2=ar^2=1•3^2=9
A3=ar^3=1•3^3=27

Option D} none of the above

Answer 2

• D) None of the above

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Let the numbers be:

• 1, x, y, z, 81

Geometric means give us:

• y² = 1*81 ⇒ y = 9

Then:

• y² = xz ⇒ xz = 81

Given options give us:

• A) 3*21 = 63 ≠ 81;
• B) 3*18 = 54 ≠ 81;
• C) Same as option A (must be a typo);

Since all the above options are false, the answer is option D.