1) which number is missing? a) b) c) d) e) f) 2) which number is missing? a) b) c) d) e) f) 3) which number is missing? a) b) c) d) e) f) 4) which number is missing? a) b) c) d) e) f) 5) which number is missing? a) b) c) d) e) f) 6) which number is missing? a) b) c) d) e) f) 7) which number is missing? a) b) c) d) e) f) 8) Which number is missing? a) b) c) d) e) f)

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