5. Let p be a prime. Show that for all integer a we have that pla" + (p – 1)! a and p|a + (p – 1)! aP

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Comes from the textbook, Elementary Number Theory 6th edtion.

5. Let p be a prime. Show that for all integer a we have that pla® + (p – 1)! a and
pla + (p – 1)! aP
Next some problems not directly related with congruencies but typical of arithmetic.
6. Five men collected several coconuts from a deserted island, and they decided to divide the
coconuts the next day. During the night, one of them decided to separate his part so he divided
the total in 5 groups and give the left-over coconut to a nearby monkey, the man went to sleep.
Next, another man did the same with the remainders coconuts and give the left-over coconut to
the monkey. During the night, every man did the same. Next morning the men divide the
remainder coconuts and give the left-over coconut to the monkey. Question: What is the
minimum number of original coconuts?
7. Ihave weights that weight power of 2 kilograms, like 1, 2, 4, 8, 16,...kilograms. Which weights
are necessary to weight 213 kilograms?
Transcribed Image Text:5. Let p be a prime. Show that for all integer a we have that pla® + (p – 1)! a and pla + (p – 1)! aP Next some problems not directly related with congruencies but typical of arithmetic. 6. Five men collected several coconuts from a deserted island, and they decided to divide the coconuts the next day. During the night, one of them decided to separate his part so he divided the total in 5 groups and give the left-over coconut to a nearby monkey, the man went to sleep. Next, another man did the same with the remainders coconuts and give the left-over coconut to the monkey. During the night, every man did the same. Next morning the men divide the remainder coconuts and give the left-over coconut to the monkey. Question: What is the minimum number of original coconuts? 7. Ihave weights that weight power of 2 kilograms, like 1, 2, 4, 8, 16,...kilograms. Which weights are necessary to weight 213 kilograms?
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