Multiple choice

In the following a wrong number series is given. Find the wrong term in the following number series? 65 219 517 1007 1737 2575

  1. 1737

  2. 2575

  3. 1007

  4. 517

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern is (n+1)^3 + n where n starts at 4: 4^3+4=68, 5^3+5=130, 6^3+6=222, 7^3+7=350, 8^3+8=520. Checking: 65→68(diff+3), 68→130(diff+62), 130→222(diff+92), 222→350(diff+128), 350→520(diff+170), 520→737(diff+217). The actual series is 65→219(diff+154), 219→517(diff+298), 517→1007(diff+490), 1007→1737(diff+730), 1737→2755(diff+1018). The term 2575 breaks the pattern; it should be 2755.

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