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Choose the most appropriate option.

$72, 76, 73, 77, 74, \underset{\text{____}}{?}, 75$

1. $70$
2. $71$
3. $75$
4. $78$

The main series follows a pattern like $+4,-3,+4,-3,\dots$

• $72+4=76$
• $76-3=72$
• $73+4=77$
• $77-3=74$
• $74+4=78$
• $78-3=75$

Option D is correct.

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