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Complete the table for Simon's selections by writing each probability as an expression in $r$ and $t$.
Mathematics 0580 · IGCSE · Probability of combined events
Probability of combined events — practice question
Simon has two boxes of cards. One box contains cards with a single shape on each one, and each shape is either a triangle or a square. The other box contains cards that are either red or blue. Simon randomly selects one card from each box. The probability of choosing a triangle card is $t$. The probability of choosing a red card is $r$.