Multiple choice

Find the 8th term of the following series. Series I: 72, 73, 81, 90, 154, 179

  1. 395

  2. 421

  3. 444

  4. 468

  5. 492
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C Correct answer
Explanation

The differences are: 73-72=1, 81-73=8 (2^3), 90-81=9 (3^2), 154-90=64 (4^3), 179-154=25 (5^2). The next difference should be 6^3 = 216. 179 + 216 = 395. The next difference should be 7^2 = 49. 395 + 49 = 444.

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