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insert 15 at position 2 i.e index 1
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array = {11,12,13,14}
n = 4
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Array[3+1] = Array[3]
i = 3
Array[2+1] = Array[2]
i = 2
Array[1+1] = Array[1]
i = 1
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array [ posi - 1 ] = 15
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n++;
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i = posi -1 i < n i++;
posi = 2
i = 1 array [i] = array [i+1] array [1] = array [2]
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i = 2 array [i] = array [i+1] array [2] = array [3]
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i = 3 array [i] = array [i+1] array [3] = array [4]
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