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three horses h1,h2,h3 entered a feild which has seven portions marked p1,p2,p3,p4,p5,p6,p7 if no two horses are allowed to enter the same portion of the feild ,in how many ways can the horses graze the grass of the feild?

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TCS Other Question

each section in the firstyear of plus two course has exactly 40 students.if there are 5 sections in how many ways can a set of 4 student representatives be selected one from each selection? how many three digit odd numbers can be formed from the digits 1,2,3,4,5 and 6 when
(a) repetition is not allowed
(b) repetition is allowed