Please use the Venn to solve the problem below A politician

Please use the Venn to solve the problem below.

A politician received 12,457 votes in his first election, and 15,322 in his second election. 9,345 voted for him in both the first and second elections. How many people voted for this politician in the first OR second election?

Solution

# (A or B) = #(A) + #(B) - #(A and B) = 12457 + 15322 - 9345 = 18434