7 35 28 140 133..........
-
399
-
665
-
951
-
240
Reveal answer
Fill a bubble to check yourself
B
Correct answer
Explanation
The pattern alternates between multiplying by 5 and subtracting 7: 7 × 5 = 35, 35 - 7 = 28, 28 × 5 = 140, 140 - 7 = 133. The next step continues with × 5: 133 × 5 = 665. This is not simple addition or subtraction.
AI explanation
The sequence alternates between multiplying by 5 and subtracting 7: 7×5=35, 35−7=28, 28×5=140, 140−7=133, and continuing the pattern, 133×5=665. Spotting the alternating operation is the key to extending the series correctly.