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Question

In an orchard row, there were 4 distinct type of fruit trees between any two pear trees. Find the position of the tenth pear tree considering the row starts with a pear tree.


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Solution

The number of distinct fruit trees between any two pear trees is 4.
The position of 2nd pear tree is 1+5=6th.

Here, pear tree is represented by a green bar.

The position of the third pear tree is 1+5×2=11th.

Similiarly, positions of pear trees is:
1,6,11,16...
position of 10th pine tree =1+5×9=46

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