The th term of a sequence is . Which of these numbers is in the sequence?
Answer and explanation
Correct answer: D. 200
- Step 1: A number is in the sequence if gives a whole-number .
- Step 2: Test : , , which is a whole number.
- Step 3: The other numbers fail: , and are not multiples of .
Answer
200.
Why not the others: 105: gives , not a whole number. 196: gives , not a whole number. 100: gives , not a whole number.
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