Multiple choice Which one number/letter is wrong in the given series: 88, 89, 180, 541, 2176 88 180 541 2176 Reveal answer Fill a bubble to check yourself C Correct answer Explanation The pattern is: aₙ₊₁ = aₙ×(n+1) + (n+1). So 88×1+1=89, 89×2+2=180, 180×3+3=543, 543×4+4=2176. The number 541 breaks this—it should be 543.