SOLUTION: student was asked to form two-digit numbers using the following digits: 0,1,2,3,4,5,6,7, and 8 How many of these are less than 40? Repeating of digits are not allowed Can you h

Question 1173434: student was asked to form two-digit numbers using the following digits: 0,1,2,3,4,5,6,7,
and 8
How many of these are less than 40?
Repeating of digits are not allowed
Can you help me with this?.... thank you so much
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

9 numbers:  0,1,2,3,4,5,6,7,8

How many of these are less than 40?

 tens digit: 3 allowed (1,2,3)

 ones digit: 9  allowed

  3x9 = 27 two-digit numbers  less than 40

Repeating not allowed: 11,22,33

 27 - 3 = 24  two-digit numbers less than 40, Repeating not allowed 

RELATED QUESTIONS

A student was asked to form two-digit numbers using the following digits:... (answered by ikleyn)
A student was asked to form two-digit numbers using the following digits:... (answered by ikleyn)
student was asked to form two-digit numbers using the following digits: 0,1,2,3,4,5,6,7,
 (answered by ewatrrr,ikleyn)
student was asked to form two-digit numbers using the following digits: 0,1,2,3,4,5,6,7,
 (answered by ewatrrr,ikleyn)
A student was asked to form two-digit numbers using the following digits:... (answered by ikleyn)
tudent was asked to form two-digit numbers using the following digits: 0,1,2,3,4,5,6,7,... (answered by ewatrrr,ikleyn)
A student was asked to form two-digit numbers using the following digits:... (answered by ikleyn)
How many two-digit odd numbers can you form using the digits 0, 1 , 2, 3, 4, 5, 6, 7, 8,... (answered by ikleyn)
How many two-digit even numbers can you form using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8,... (answered by Edwin McCravy,ikleyn)