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Nth Term: How do you work out these 3?

Nth Term: How do you work out these 3?-example-1

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Question 3:

50-3n=5

therefore,

50-5=3n

45=3n

n=45/3

n=15

The 15th term of the sequence has a value of 5.

sorry i am not sure about the rest, i am new to this topic and have just started learning it.

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