By Thomas W. Wieting

Mathematical idea of Chromatic aircraft embellishes (Pure & utilized arithmetic)

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6 Prove (again in two ways) that n k = n n−1 k k−1 . 7 Prove (in two ways) that for 0 ≤ c ≤ b ≤ a, a b a a−c = b c a−c b−c 22 1. Let’s Count! 8 In how many ways can you seat 12 people at two round tables with 6 places each? Think of possible ways of deﬁning when two seatings are diﬀerent, and ﬁnd the answer for each. 5, (e) 0, (f) 1024. 10 List all subsets of {a, b, c, d, e} containing {a, e} but not containing c. 11 We have not written up all subset relations between various sets of numbers; for example, Z ⊆ R is also true.

The ﬁrst child comes and takes the ﬁrst n1 presents, starting from the left. Then the second comes and takes the next n2 ; then the third takes the next n3 presents etc. Child k gets the last nk presents. It is clear that we can determine who gets what by choosing the order in which the presents are laid out. There are n! ways to order the presents. But of course, the number n! overcounts the number of ways to distribute the presents, since many of these orderings lead to the same results (that is, every child gets the same set of presents).

2 Comparing and Estimating Numbers 31 language of calculus, we have n 2 →∞ n (n → ∞) . Here is another simple question: Which is larger, n2 or 2n ? For small values of n, this can go either way: 12 < 21 , 22 = 22 , 32 > 23 , 42 = 24 , 52 < 25 . But from here on, 2n takes oﬀ and grows much faster than n2 . For example, 210 = 1024 is much larger than 102 = 100. In fact, 2n /n2 becomes arbitrarily large, as n becomes large. 1 (a) Prove that 2n > n n 3 if n ≥ 3. (b) Use (a) to prove that 2 /n2 becomes arbitrarily large as n becomes large.