A certain comet is visible on earth once in every x years - that is, it has a periodicity of exactly x years. Three of the years in which it was seen are 1780, 1861 and 1987. Which of these could be the value of x?
Answers
Answered by
2
Answer:
x =1861
Step-by-step explanation:
x=1861 bez that is the answer
Answered by
2
Answer:
9
Step-by-step explanation:
1861-1780=81
81 is divisible by 9
so...9
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