Question

Please give detailed solutions​

Answer 1

Answer:

(1) sum of the digits is less than or equal to 99

i.e sum of the digits is less than 100.

(2) given that ,none of the digits is 0,5,6,7,8,9.

i.e the digits may be 1,2,3,4.

here sum of the digits < 100

maximum no. of 4's are < 100/4

=> maximum number of 4's = 24

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