How many three-digit numbers are composed of three distinct digits such that one digit is the average of the other two? (A) 96 (B) 104 (C) 112 (D) 120 (E) 256
How many three-digit numbers are composed of three distinct digits such that one digit is the average of the other two? (A) 96 (B) 104 (C) 112 (D) 120 (E) 256
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.2: Arithmetic Sequences
Problem 52E
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Step 1
If the “average” digit is 1, then the other two digits are 0 and 2. For example, 210.
If the “average” digit is 2, then the other two digits are 1 and 3 OR 0 and 4. For example, 321 and 420.
If the “average” digit is 3, then the other two digits are 2 and 4 OR 1 and 5 OR 0 and 6. For example, 432, 531 and 630.
If the “average” digit is 4, then the other two digits are 3 and 5 OR 2 and 6 OR 1 and 7 OR 0 and 8. For example, 543, 642, 741 and 840.
If the “average” digit is 5, then the other two digits are 4 and 6 OR 3 and 7 OR 2 and 8 OR 1 and 9. For example, 654, 753, 852 and 951.
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