(a) Prove that, for all natural numbers n, 2 + 2 · 2 2 + 3 · 2 3 + ... + n · 2 n = (n − 1)2n+1 + 2.
(b) Prove that, for all natural numbers n, 3 + 2 · 3 2 + 3 · 3 3 + ... + n · 3 n = (2n − 1)3n+1 + 3 4 .
(c) Prove that, for all natural numbers n, 1 2 + 42 + 72 + ... + (3n − 2)2 = 6n 3 − 3n 2 − n 2 .
Prove by Induction 24.) Prove that for all natural numbers n 2 5, (n+1)! 2n+3 b.) Prove that for all integers n (Hint: First prove the following lemma: If n E Z, n2 6 then then proceed with your proof.
3. Show that (1.2)+(2-3)+(3.4) + ... + n(n+1) = n(n+1)(n+2) for all natural numbers n = 1,2,3,... 3 4. Show that n2 + 3n is divisible by 2 for all natural numbers n 2 1
Prove that for each natural number n 26 we have 2n 3 3 2" Use the above to prove that for each natural number n 2 6 we have (n +1)2 Hint: n24n +4-(n2 +2n +1) + (2n+3).] 2" Prove that for each natural number n 26 we have 2n 3 3 2" Use the above to prove that for each natural number n 2 6 we have (n +1)2 Hint: n24n +4-(n2 +2n +1) + (2n+3).] 2"
4. Show that n2 + 3n is divisible by 2 for all natural numbers n 21
Prove that the following premise 4. Prove the following: (a) Prove that n is even if and only if n2 6n+5 is odd. (b) Prove that if 2n2 +3n +1 is even, then n is odd.
demonstrates the validity for all n belonging to N (natural numbers) a) divisible by 3 b) divisible by 9 c) divisible by 13 d) divisible by 64 Demostrar la validez de las siguientes afimaciones para todo n e N. a) 2n (-1)n+1 es divisible entre 3, b) 10 3 4n+1 +5 es divisible entre 9, c) 52n (1)"+1 es divisible entre 13, d) 72n 16n - 1 es divisible entre 64,
1. (Integers: primes, divisibility, parity.) (a) Let n be a positive integer. Prove that two numbers na +3n+6 and n2 + 2n +7 cannot be prime at the same time. (b) Find 15261527863698656776712345678%5 without using a calculator. (c) Let a be an integer number. Suppose a%2 = 1. Find all possible values of (4a +1)%6. 2. (Integers: %, =) (a) Suppose a, b, n are integer numbers and n > 0. Prove that (a+b)%n = (a%n +B%n)%n. (b) Let a,...
Please use induction to prove the following question for all natural numbers n. (d) Prove that vns įt<2vn.
13. (i) For each of the following equations, find all the natural numbers n that satisfy it (a) φ(n)-4 (b) o(n) 6 (c) ф(n) 8 (d) φ(n) = 10 (ii) Prove or disprove: (a) For every natural number k, there are only finitely many natural num- bers n such that ф(n)-k (b) For every integer n > 2, there are at least two distinction integers that are invertible modulo n (c) For every integers a, b,n with n > 1...
8. By mathematical induction, prove that the expression 33n-+3 altiple of 169 for all natural numbers n. (20 Points)