maths question help?

2017-02-12 10:12 pm
a model of a bicycle is available in 5 frame sizes. for every frame size there are 7 colours. there are 3 sets of gears that can be fitted on the smallest 2 frame size and 5 sets that can be fitted on the three larger frame sizes. 
Noah is buying the largest frame size.
In how many different ways can he choose the colour and gears for his bike

回答 (1)

2017-02-12 10:40 pm
2 x 7 x 3 = 42 --- smaller frame size
3 x 7 x 5 = 105 ---- larger frame size


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