when there are seven rows in class mark we take the fifth one as assume mean then when there are 6 rows in class mark which ro will be taken as assume
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when there are seven rows in class mark we take the fifth one as assume mean then when there are 6 rows in class mark which ro will be taken as assume
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Permutation of n different objects The number of permutations of n objects
taken all at a time, denoted by the symbol nPn
, is given by
P
n
n = n , ... (1)
where n = n(n – 1) (n – 2) ... 3.2.1, read as factorial n, or n factorial.
The number of permutations of n objects taken r at a time, where 0 < r ≤ n,
denoted by nPr
, is given by
nPr
=
n
n r −
We assume that 0 1