Multiple choice

Nth term in a series is given by Tn = 40n + 20. Which term will be equal to 420?

  1. 100th term

  2. 10th term

  3. 5th term

  4. 1st term
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

40n + 20 = 420. 40n = 400. n = 10.

AI explanation

Set the given formula 40n + 20 equal to 420 to solve for the variable n. Subtracting 20 from 420 leaves 400, and dividing 400 by 40 gives 10. Therefore, the 10th term equals 420.

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