निम्नलिखित संख्या श्रृंखला में लुप्त संख्या ज्ञात कीजिए: 3, 5, 9, ?, 23, 33

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?