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A selection is to be made for one post of Principal and two posts of Vice-Principal. Amongst the six candidates called for the interview, only two are eligible for the post of Principal while they all are eligible for the post of Vice-Principal. The number of possible combinations of selectees is 

(a) 4 (b) 12 (c) 18 (d) None of the above

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(d) Number of ways to select Principal = 2C1 

Number of ways to select Vice Principal = 5C2 

Total number of ways = 2C1 + 5C2

Number of possible combinations of selectres = 2 × 10 = 20

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