Lesson 13 of 16
Checkpoint: sums, squares and sequences
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You add 10 odd numbers and 3 even numbers. Is the sum odd or even?
A 3 by 3 magic square has 24 in the centre. What is its magic sum?
5 beats give 8 rhythms. 6 beats give 13 rhythms. How many rhythms have 7 beats?
In A + A + B = AA, what is B?
Which expression is always odd, for every whole number n?
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