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number of ones required when writing out all numbers between 0 and n. For example, f(13)=6. Notice that f(1)=1. What is the next largest n such that f(n)=n? ’s the coolest hack you’ve ever written? 19.’Tis known in refined pany, that choosing K things out of N can be done in ways as many as choosing N minus K from N: I pick K,you the remaining. Find though a cooler bijection, where you show a knack uncanny, of making your choices contain all K of mine. Oh, for pedantry: let K be no more than half N. number es next in the sequence:10, 9, 60, 90, 70, 66,? A)96 B) 1000000000000000000000000000000000 0000000000000000000000000000000000 000000000000000000000000000000000 C) Either of the above D) None of the above 29 words or fewer, describe what you would strive to acplish if you worked at Google Labs. 3