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A sequence is formed by adding 2 to the triple of the previous term. If the first term is 1, how many multiples of 5 less than 10,000 would be terms of the sequence?

 Dec 11, 2021
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The sequence is as folllows:

 

1,  5,  17,  53,  161,  485,  1457,  4373  - that is it.

 

Just 2 multiples  of 5 < 10,000, and that is: 5  and  485.

 Dec 12, 2021

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