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ANSWER :-
A baker has cupcakes in a line = n
They put two (identical) cherries on two cupcakes from each sub-line.
Let 
Here we need to find the ordinary function of 
By the use of two cupcakes from each sub-line.
the function is
Therefore the ordinary generating function
we already know that the formula for
By cancellation of (n-1)(n-2) in numerator and denominator
Since, in n/2 no.of ways this can happen.
Finally,we found ordinary generating function and no.of ways that happens.
Thank you
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n.C2
rl 7t
rl 7t
n.C2
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(n - 2) (n 1)2!
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2
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.
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