Question 1192984
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            I will give another solution,  which leads to the same answer.



<pre>
In all, there are 7! = 7*6*5*4*3*2*1 = 5040 permutations.


Favorable are those that have 1-st yellow, 2-nd white and 7-th pink;

    the rest 4 tulips may go in arbitrary order; 

    so the number of favorable arrangements is 4! = 24.


Therefore, the probability under the problem's question is  P = {{{24/5040}}} = 0.004762  (rounded).    <U>ANSWER</U>
</pre>

Solved.