Query On Future Contract

#1
Hi Members,

I have some doubt over the future contract, please solve my query.
when i log in to my dmat account. I see 3 -4 contracts for example Hindalco industry
HINDAL FUTSTK 25-Aug-2011 1000 157.05
HINDAL FUTSTK 29-Sep-2011 1000 156.10
HINDAL FUTSTK 25-Oct-2011 1000 157.10

so all of the above contracts has 3 different expiry dates spread over 3 Months. Is there a difference in between above 3. Because suppose if i anticipate that price may go high I will always choose the oct expiary because that provides
me a longer time, so the possibility of reversal is there if the price moves to downwards in first month.

Is there a difference in terms of brokerage/Margin etc that i have to pay for a longer time contracts.???

Thanks IN advance
 

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