Question

N is a natural number. The function root(N) is defined as follows: root(N)=N if N< OR equal to 9 OR is equal to root(sum(N) otherwise. where sum (N) denotes the sum of the digits of N. For example, root (8)=8 , root (978)=root(9+7+8)=root(24)=root(2+4)=root(6)=6. How many values of N satisfy the condition N<450 and root (N)=9. A.40 B.49 C.54 D.61

Answer 1

I'm thinking 54.

Answer 2

can you explain please ?

Answer 3

answer is 49 in the solution :(

Answer 4

yup answer 49

Answer 5

how to do this ?

Answer 6

@Madi_Lee @debpriya @studygirl13 Please don't Provide Wrong Answers !
Can You Please Show How You Did The Calculations...?

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Answer 7

@debpriya Are you online ?

Answer 8

Ref: http://prntscr.com/adkal1