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The first integral term in the expansion of 3 + 2 3 9 , is the

Options

  1. A2 n d t e r m
  2. B3 r d t e r m
  3. C4 t h t e r m
  4. D5 t h t e r m

Correct answer

C. 4 t h t e r m

Step-by-step solution

3 + 2 3 9 = 3 1 2 + 2 1 3 9 ∴     T r + 1 = 9 C r 3 1 2 9 - r 2 1 3 r For first integral term, r = 3 ⇒ T 3 + 1 =   9 C 3 3 3 . 2 1 i.e., T 3 + 1 = T 4

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