You are given N blocks of height 1…N. In how many ways can you arrange
these blocks in a row such that when viewed from left you see only L
blocks (rest are hidden by taller blocks) and when seen from right you
see only R blocks?
Examples:
1)For N=3, L=2, R=1 there is only one arrangement {2, 1, 3}.
2)For N=3, L=2, R=2 there are two ways {1, 3, 2} and {2, 3, 1}
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