Pls help I suck at math but I need go to do this

Answer this question, only if you know the answer. 30 points and brainliest!

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality