sierransha08
29.07.2020 •
Mathematics
a beetle sets out on a journey. on the first day it crawls 1m in a straight line. on the second day it makes a right-angled turn (in either direction) and crawls 2m in a straight line. on the third day it makes a right-angled turn (in either direction) and crawls 3m in a straight line. this continues each day with the beetle making a right-angled turn ( in either direction and crawling 1m further than it did the day before. what is the least number of days before the beetle could find itself stopped at its starting point?
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Ответ:
7
Step-by-step explanation:
The signed sum of sequential odd numbers must be zero, as must the signed sum of sequential even numbers.
The minimum number of sequential even numbers that have a sum of 0 is 3: 2+4-6 = 0.
The minimum number of sequential odd numbers with a sum of zero is 4: 1-3-5+7=0.
Since we start with an odd number, we can get these sets of numbers in 7 days. The attached diagram shows one possible route.
Ответ: