How many terms are there in the expansion of ( a^2 b^2 + b^2 a^2 +2 )^ 21 where a 0, b 0?

NDA 2021 Mathematics question

How many terms are there in the expansion of

(++

where , ?

Answer: (D)

. So the given expression is . A binomial raised to the power 42 has terms, and here they are all distinct

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Question ID VK-033631