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ErrOr In Marking scheme of Add Maths Oct/Nov 2011 Paper1 Code11

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pakiboy

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Check Out This uploaded image . this is quest. no. 4 part 4 . according to my solution it should be 192. where as they think that 168 is the right ans. So you guyz tell who is the right.
 

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pakiboy

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Hey I think I am little bit weak in this chap that is permutations and combination can you give me notes for this chao and for relative velocity too !!!!!!!
thanks in advance!!!!!!!!!!!!!!!!!
 
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