Shubham has to make a telephone call to his friend Nisheeth. Unfortunately he does nomen 7 digit phone number. But he remembers that the first three digits are 635 or 674, the number and there is exactly one 9 in the number. The maximum number of trials that Shubham has to make to be successful is N then (N-3400) is equal to

Shubham has to make a telephone call to his friend Nisheeth, Unfortunately he does not remember the 7 digit phone nu is exactly one 9 in the num is a four digit number of the form abcd then c equal. mber. But he remembers that the first three digits are 635 or 674, the number is odd and there ber. The maximum number of trials that Shubham has to make to be successful

Sam has forgotten his friend's seven-digit telephone number. He remembers the following: the first three digits are either 635 or 674, the number is odd, and the number nine appears once, what is the minimum number of trials he has to make before he can be certain to succeed?

A boy forgets the last two digits of his friend's telephone number. He however remembers that they are different numbers. If he dials at random, the probability that he dials correctly is

A three digit number n is such that the last two digits of it are equal and different from the first.The number of such n' is

A three digit number n is such that the last two digits of it are equal and different from the first , the number of such n's is

A mobile has a pass code of distinct digits. What is the maximum number of attempts one makes to retrieve the pass code ?

An old man while dialing a 7-digit telephone number remembers that the first four digits consist of one 1's, one 2's and two 3's. he also remembers that the fifth digit is either a 4 or 5 while has no memory of the sixt digit, he remembers that the seventh digit is 9 minus the sixth digit, maximum number of distinct trials he has to try to make sure that he dials the correct telephone number, is A. 360 B. 240 C. 216 D. none of these

A mobile number consists of ten digits. The first four digits of the number are 9, 9, 8 and 7. The last three digits are 3, 5 and 5. The remaining digits are distinct and make the mobile number, the greatest possible number. What are these digits?