Multiple choice Find the wrong number among the given series. 23, 46, 138, 551, 2760 23 551 138 2760 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The pattern is successive multiplications: 23×2=46, 46×3=138, 138×4=552 (not 551), 552×5=2760. The number 551 breaks this pattern - it should be 552.