5,10,15,20 What is the next number? What is the 100th term?

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5,10,15,20
What is the next number?
What is the 100th term?

Increment is by 5, so next number is 20 + 5 = 25
Formula for nth number is 5 * n
With n = 100, we have 5 * 100 = 500