Father is 40 years old now and the son 5 years old. When the son becomes 40 years old, what would be the age of father ?
"416584751329252912536828731624549"
How many such 5s are there in the above arrangement each of which is immediately preceded by an odd digit and also immediately followed by an odd digit?
Which of the following is sixth to the left of the eighteenth digit from the left end of the above arrangement?
If all the even digits are deleted from the above arrangement, which of the following will be eighth from the right end of the arrangement?
How many such 4s are there in the above arrangement, each of which is immediately followed by a perfect square? (1 is also a perfect square.)
"416584751329252912536828731624549 "
How many 2s are there in the above arrangement, each of which is immediately preceded by a digit which has a numerical value of less than two?