A locker at the world famous WTC building can be opened by dialing a fixed three digit code(between 000-999).Don only knows the number is a three digit number and has only one six.Using this info he tries to open the locker by dialing at random.The probability that he succeeds in his endevour is
A. 1/243
B. 1/900
C. 1/1000
D. 3/216
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We hv to find out total 3 digit number which hv only one '6' digit so as we know the total digit formula ,
(9*9*1)*3=243 (here we multiply 3 bcoz '6' can be 1st,2nd & 3rd position )
now we hv to select only one number out of 243 digit thats why Answer is
A. 1/243
Option A is correct In my previous comment I gve wrong choice
Option is C
Answer = A (1/243)