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We have 6 Articles, with 2 and 2 articles of same kind.
By laws of permutation, the number of ways to arrange these are: 6!/2!*2! = 180 ways
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Bunuel
Dennis's teacher gave his class a task of planting trees. Dennis and his 5 friends thought of planting 6 trees in a row, so they bought one sapling each. How many ways could they plan them if one friend bought Rose sapling, 2 of them bought identical Blackberry saplings, 2 bought identical tulip saplings and one bought an orchid sapling?

A. 120
B. 160
C. 180
D. 200
E. 240
Total Arrangements of 6 different saplings = 6*5*4*3*2*1 = 6! =720

But since two of them are blackberry (identical)and other two ae Tulip (identical) therefore their arrangements need to be excluded

Total acceptable different arrangements = 720/(2!*2!) =180

Answer: Option C
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