Probability of 7/7 Drill and Attack Coinciding

LU Stations: 274

Probability of one attack by hour (5yr mean): One chance in 9,474,920

Open Hours per Day: 19

Probability of 3 station terror hit (5yr mean):

One chance in 850,602,500,906,920,000,000

Open Days a Year: 364

Mean Sample frequent (yrs) 5 Probability of one attack by hour (10yr mean):

One chance in 18,949,840

Mean Sample frequent (yrs) 10 Probability of 3 station terror hit (10yr mean):

One chance in 6,804,820,007,255,360,000,000

Same Time 3

LU Stations: 274

Probability of drill on 1 stations per hour:

One chance in 817,342

Open Hours per Day: 19

Probability of drill on 3 stations per hour:

One chance in 546,023,643,432,766,000

Open Days a Year: 157

Same Time 3

PROBABILITY OF DRILL AND TERROR ATTACK COINCIDING BY CHANCE (10yr mean):

One chance in 3,715,592,613,265,750,000,000,000,000,000,000,000,000 = 3.716 x 1039

Estimate of Grains of sand in the whole world:

7,500,000,000,000,000,000 = 7.5 x 1018

(http://www.miamisci.org/tripod/whysand.html)

In context: If I go to a beach, or a desert, or under the sea and pick a single grain of sand. What chance is there of you going to the same part of the world by chance and picking up the same grain? You are trillions of times more likely to do this that the London drill coinciding with this attack at that hour