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Product Rule for Counting - Maths HWK help

please help me I'm really stuck, here is the question:

Zara has forgotten her 4-digit PIN code.
She knows the first digit is a factor of 20 and the 4 digits make a number divisible by 5.
How many different sets of 4 digits could it be?
Reply 1
imagine using hegarty maths omegalul

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