2, 15, 4, 12, 6, 7, ?, ?

Assume the missing terms of the series to be x1 and x2.

The sequence 2, 15, 4, 12, 6, 7, x1 x2 is a combination of 2 series:

  1. 2, 4, 6, x1
  2. 15, 12, 7, x2

In sequence I, consecutive even numbers exist.

The missing term, x1 = 8.

The sequence II, the pattern is – 3, – 5,……

The missing term, x2 = 7 – 7 = 0.

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