5. The Number of numbers not exceeding 1000
formed by using the digits 1,2,3,4,5,6,7,8,9
without repetition is:
a) 384
b) 585
c) 364
d) 529
Answers
Answered by
3
Answer:
,,,,,,,,
ᴏɴᴇ ᴅɪɢɪᴛ ɴᴜᴍʙᴇʀ ᴄᴀɴ ʙᴇ ғᴏʀᴍᴇᴅ =
ᴛᴡᴏ ᴅɪɢɪᴛ ɴᴜᴍʙᴇʀ ᴄᴀɴ ʙᴇ ғᴏʀᴍᴇᴅ = × =
ᴛʜʀᴇᴇ ᴅɪɢɪᴛ ɴᴜᴍʙᴇʀ ᴄᴀɴ ʙᴇ ғᴏʀᴍᴇᴅ = × × =
ᴛᴏᴛᴀʟ =++=
Answered by
5
Answer:
1,2,3,4,5,6,7,8,9
One digit number can be formed =9
Two digit number can be formed =9 × 9=81
Three digit number can be formed =9 × 9 × 9=729
Total =9+81+729=819
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