General Maths Puzzle Category

A lady purchases 200 worth product at a shop where the shopkeeper sales his products at no profit. At billing she gives a 1000 rupees note. The shopkeeper gets change for 1000 rupees note at shopkeeper-2. And gives the balance 800 to that lady..
After that lady leaves the shop shopkeeper-2 says that 1000 rupees note is afake one and demands for his money.
Then what is the net loss to the shopkeeper

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General Other Question

Die A has four red and two white faces. Die B has two red and four white faces. A coin is flipped once. If it falls heads, the game continues by throwing die A alone; if it falls tails, die B is to be used. If the first two throw resulted in red, what is the probability of red at the third throw ? Nuber series..
1,4,5,6,7,9,11,.....
what is next number