Linkon, in my view, this 4900 straddle is risky.
it just need 2% move on nifty to hit back at you. And almost 67% on the days, nifty has moved 2% or more.
And specially sitting near one of the most volatile time, IMO, this is going to give u roller coaster ride.
With nifty being at 4855, the Intrisic val of this strddle is 45.. that means this straddle has only 45 rs of time value for remaining 3 days. I would rather buy this straddle and catch the people who trade against the odds. With buy, I will have 67% odds in my favour. ( I am generally straddle seller but near the expiry, the game changes and odds start coming in favour of buyer).
Take another day and if this ATM straddle is available at 75 Rs. i.e. 1.5% of nifty, the odds of 1.5 % or larger move go up to almost 83%.
That is my view of looking at it, hope this helps u in selecting the strategy.
Happy Trading