Bomb Blasts and Arithmetic Progression

After having a near-close encounter with September 13 Delhi Blasts, the least expected was the shocking November 26 Mumbai Blasts. 

Now, the mathematically inclined have 'discovered' an Arithmetic Progression of these blasts:

13 May 2008: Jaipur  (nine blasts within a span of 15 minutes)

June 2008: ---

26 July 2008: Ahemdabad (21 blasts within a span of 70 minutes)

August 2008: ---

13 September 2008: Delhi (5 blasts within a span of 31 minutes, and a few more)

October 2008: ---

26 November 2008: Mumbai Mayhem 

Indians seem to have FINALLY woken up:

• Mumbai terrorist attacks are a wake-up call for India
• Mumbai Terror: Last Wake up Call For The Country
• Zero tolerance only answer to terrorism
  
• Mumbai Terror: Citizens against inaction against Pakistan Petition
  
• Citizens target politicians post Mumbai terror attacks
  
• Mumbai terror: Angry citizens protest
  

 Hopefully, INDIA WOULD NOT GO BACK TO SLEEP.

HOPEFULLY, NOTHING HAPPENS ON 13 January 2008.