can u please explain 2 c)
also 1 b) (i got the same answer just want to know approach)
my 1b) -
(n+1 ‘R’) (1 ‘L’) (m ‘U’) but ‘L’ cant come first or last - so only n/(n+2) cases valid
(n + m + 2)! n
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(n + 1)! m! (n + 2)