self Maths Puzzle

addition table for(Z5,+5)

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self Other Question

A shop sells chocolates at re.1 each. U can exchange 3 wrappers for 1 chocolate. If u have Rs.100, how many chocolates can you totally get? prove that if *is an associativebinary composition IN ASET A SUCH THA EVERY ELEMENT OF A IS INVERTIBLE THEN 8 SATISFIES HCANCELLETION LAWS