Flag Algebra> permutation and combination...
question mark

the no of distict 4 digit nos. which have at most 2 distinct digits?

shruti gupta , 14 Years ago
Grade 11
anser 1 Answers
Chetan Mandayam Nayakar

Last Activity: 14 Years ago

The last digit cannot be zero. Therefore there are 9 possible choices. Another digit can independently have 10 different choices and the remaining two digits are fixed. Thus, the answer is 9*10 = 90

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments