In a rangoli, 12 lamps are in a line. A green lamp is 4th from left. How many lamps are to its right?
8
This is a simple linear-position problem: knowing an item's rank from one end of a row and the total count, we can find how many items lie on the other side of it.
The rangoli has a line of \(12\) lamps in total.
The green lamp is 4th from the left, which means 4 lamps — including the green lamp itself — are counted up to and including its position.
Every lamp that is not in that left block of 4 must therefore lie to the right of the green lamp.
So the lamps to its right = total lamps minus the 4 counted up to the green lamp = \(12 - 4 = 8\).
The underlying rule is \(\text{items on the right} = \text{total} - \text{rank from left}\), where the rank already includes the item itself, so no extra +1 or −1 adjustment is needed.
Hence the number of lamps to the right of the green lamp is 8.
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