$\frac{1}{{1!(n - 1)\,!}} + \frac{1}{{3!(n - 3)!}} + \frac{1}{{5!(n - 5)!}} + .... = $
$\frac{1}{{1!(n - 1)\,!}} + \frac{1}{{3!(n - 3)!}} + \frac{1}{{5!(n - 5)!}} + .... = $
- A
$\frac{{{2^n}}}{{n!}}$; for all even values of $n$
- B
$\frac{{{2^{n - 1}}}}{{n!}}$; for all values of $n$ i.e., all even odd values
- C
$0$
- D
None of these
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