Grade 11Algebra
Find the number of n digits formed using first five natural number which contain the digits 2 and 4 essiantially?
1 Answer
Kajal modi
Total no. using 1,2,3,4,5 is 5^n . Numbers not containing 2,4 are 3^n . Numbers not containing 2 are 4^n and numbers not contaiing 4 are 4^n . Total no. containing 2,4 essentially are 5^n-2×(4^n)-3^n.
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