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How do you do this P&C question: N85/I/3 (about the placing of 4 objects)?
i) You need to consider cases in this part of question
Case 1 : a is in the right box A and the rest wrong
Nos of ways = 1 (a in box A) x 2 (c or d in box B) x 1 (d in box C) x 1 (b in box D) = 2
Case 2 : b is in the right box B and the rest wrong
Nos of ways = 2
Case 3 : c is in the right box C and the rest wrong
Nos of ways = 2
Case 4 : d is in the right box D and the rest wrong
Nos of ways = 2
Total nos way = 8