Question

Ranjan said,"who does not know the name of Rabindranath?(change affirmative)
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Answer 1

$\huge\sf\underline{Required\:Answer}$

Ranjan said that everybody knew the name of Rabindranath.

Explanation ↴

When changing sentences from negative interrogative to affirmative, we must take care about the meaning of the negative interrogative sentence as we know that we can't change the meaning of the sentence when we are going to make it affirmative.

According to rules of changing sentences from negative interrogative to affirmative, 'Who does not' is replaced by the word 'Everybody'.

Answer 2

Ranjan said that everybody know the name of Rabindranath.

According to rules of changing sentences from negative interrogative to affirmative, 'Who does not' is replaced by the word 'Everybody'.

☇Hope it helps☇