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 10^{39}

Estimate
of Grains of sand in the whole world:

7,500,000,000,000,000,000
= 7.5 x 10^{18}

(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