How many total numbers of not more than 20 digits that can be formed by using the digits 0, 1, 2, 3, and 4 is	Answers
A) 5 20
B) 5 20 – 1
C) 5 20 + 1
D) 6 20
E) None of these
Number of single digit numbers = 5   Number of two digits numbers = 4 × 5   ∵ [0 cannot occur at first place and repetition is allowed]   Number of three digits numbers   = 4 × 5 × 5 = 4 × 5(2)   .... .... .... ....   .... .... .... ....   Number of 20 digits numbers = 4 × 5(19)   ∴ Total number of numbers   = 5 + 4.5 + 4.5(2) + 4.5(3)........4.5(19)   = 5 + 4⋅5(519−1)5−14⋅5(5[19]−1)5−1 = 5 + 5(20) - 5 = 5(20)   5 20nswer 5 20
<result>A</result>
How many total numbers of not more than 20 digits that can be formed by using the digits 0, 1, 2, 3, and 4 is