Question

how many numbers are there between 100 and 1000 such that every number is either 2 or 9

Answer 1

HELLO DEAR

It's a simple question,

hundred's place can be filled in 2 ways 2 or 9.

tens place can be filled in 2 ways 2 or 9

ALSO,

units place can be filled in 2 ways (
2 or 9


THEN,

the three places can be filled in 2 x 2 x 2 = 8


I HOPE ITS HELP YOU DEAR,
THANKS