The sequence 4, 10, 20, 34, ... has a constant second difference. What is the next term?

Answer and explanation

Correct answer: C.

  1. Step 1: First differences: 6, 10, 14. Second difference: 4.
  2. Step 2: The next first difference is 18, so the next term is 34 + 18 = 52.
Answer
.
Why not the others: : the first difference was assumed to be constant. : the second difference was added to the last term instead of the next first difference. does not fit.

Practise more Geometry, sequences and counting.

Free questions with an explanation for every one, and full timed National Benchmark Tests (NBT) mock tests.

All Geometry, sequences and counting questionsTake a mock test

More Geometry, sequences and counting questions

The sequence 4, 10, 20… | National Benchmark Tests (NBT)