Impossible, possible, or certain (with complements)
Use impossible, possible, and certain to describe an event and its complement (the event NOT happening). Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
A bag has 3 green and 1 purple marbles. If you pull one marble without looking, is picking a blue marble impossible, possible, or certain?
Answer: impossible
See one solved, step by step
A bag has 5 red and 2 yellow marbles. If you pull one marble without looking, is picking a green marble impossible, possible, or certain?
📘 Worked solution
1The bag has 5 red and 2 yellow marbles.Count how many of each colour are in the bag.
2There are no green marbles in the bag.Compare the count of green marbles to the total.
3Answer: impossibleA colour that isn't in the bag can never be pulled.
Ready to master it?
Jump into unlimited practice — your Winny Score tracks you to 100. And if it won't click, a real tutor will make it click: first lesson free.
Start practicing