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Most Important Selected Qs for JEE AdvancedMathematicsSequences and Series

Let, t _ r = r ! and S _ n = _ r =1 ^ n r ! then S _ n 24 = a + 24 ; a , N where is

Options

  1. A7
  2. B23
  3. C9
  4. Dnone of these

Correct answer

C. 9

Step-by-step solution

4!=245!=24 56!=24 5 61!+2!+3!=9 So, 1!+2!+3!+ . .100!=9+24 p =9

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