Question
Thu January 03, 2013

# The number of natural numbers which are less than 2*100000000 and which can be written by means of the digits 1 and 2.

Mon January 07, 2013
Answer : To find : The number of natural numbers which are less than 2*100000000 and which can be written by means of the digits 1 and 2

As the number should be less then 2 00000000 therefore by using principle of counting
on the first place { from ryt} 1 and 2 digit both can be used , going to the 8th position , but the 9th position {from ryt } can have only 1 digit as putting 2 would increase the no. from 200000000,
therefore the no. of such no required are = 1* 2*2*2*2*2*2*2*2 = 256 Answer
Related Questions
Thu April 06, 2017

# Q) Total number of permutation of "K" different things in a row taken not more than "r " at a time (each thing may be repeated any number of times ) is equal to

Sat March 25, 2017

# how many ways can the letter of word ARRANGE be arranged such that A's dont occur together

<<<<<<< .mine ======= >>>>>>> .r8835