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NDA2022MathematicsBinomial TheoremActual

How many terms are there in the expansion of (1+ 2 x )^9 (1- 2 x )^9 ?

Options

  1. A9
  2. B10
  3. C19
  4. D20

Correct answer

B. 10

Step-by-step solution

(1+ 2 x )^9 (1- 2 x )^9= (1- 4 x^2 )^9 Number of terms =9+1=10

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