BOC0005
contestada

the sum of the digits 2014 is 7. How many whole numbers between 100 and 999 have 9 as the sum of their digits?

Respuesta :

Answer:

45

Step-by-step explanation:

this should be correct :)

There are 9 in the 100's

108

117

126

135

144

153

162

171

180

There are 8 in the 200's  (starting to see a pattern?)

207

216

225

234

243

252

261

270

There are 7 in the 300's

306

315  

324

333

342

351

360

9+8+7+6+5+4+3+2+1 = 45