When we add (1+x)²⁰ and (1-x)²⁰, odd power terms cancel. Only even power terms remain: x⁰, x², x⁴, ..., x²⁰ = 11 terms.
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JEE Main 2022 — Mathematics Algebra
medium
mcq
2022
Official previous-year question
Verified 30 May 2026.
Question
The number of terms in the expansion of (1 + x)²⁰ + (1 - x)²⁰ is:
Options
- A10
- B11
- C20
- D21
Solution
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