Find the wrong number in the series. Series: 7, 8, 18, 57, 228, 1165, 6996

Correct answer: 228

The pattern is: multiply the previous term by the next natural number and then add the same number.

• 7 × 1 + 1 = 8

• 8 × 2 + 2 = 18

• 18 × 3 + 3 = 57

• 57 × 4 + 4 = 232, but the series gives 228.

• With 232 in that place, the next terms are 232 × 5 + 5 = 1165 and 1165 × 6 + 6 = 6996.

Final answer: 228 is the wrong number.