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MATH / How many 4-digit numbers have the last digit equal to the sum of the first two digits?

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

How many 44-digit numbers have the last digit equal to the sum of the first two digits?
Plain-text mathematical notation (without MathML)
How many 4-digit numbers have the last digit equal to the sum of the first two digits?
Original LaTeX notation
How many $4$-digit numbers have the last digit equal to the sum of the first two digits?

level

Level 4

type

Counting & Probability

Discussion

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Source and history

Official source

initial import