New Delhi, Aug 7: An interesting election to the post of deputy chairman of the Rajya Sabha would take place on Thursday at 11 am. The BJP led NDA, would hope to win the poll. However if one looks at the numbers today, the NDA is falling short by 32. With one seat, vacant in the 245 member House, the magic number is 122. The NDA has 90 while the opposition 112. In this scenario, it is the 42 undecided candidates who would make all the difference.