Friday

May 6, 2016
Posted by **arzam** on Thursday, May 2, 2013 at 1:40pm.

a)that the number is greater than 68

b)the number is a multiple of 9

c) it is less than 100

d) it contains at least one 5 (i.e a number such as 15 or 55

- math -
**Steve**, Thursday, May 2, 2013 at 2:09pmThere are 90 2-digit numbers

a) 32 are greater than 68, so prob = 32/90

b) 10 are multiples of 9, so ...

c) all are less than 100, so ...

d) 18 have at least one 5, so ... - math -
**PsyDAG**, Thursday, May 2, 2013 at 2:15pmThere are 90 two-digit numbers (10-99).

a) 31/90 = ?

b) 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 are multiples of 9.

c)*All*two-digit numbers are less than 100.

d) 15, 25, 35, 45, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 65, 75, 85, 95 all have at least one 5. - math -
**Steve**, Thursday, May 2, 2013 at 2:19pmMy bad on (a). PsyDAG is correct

- math -
**arzam**, Thursday, May 2, 2013 at 2:42pmthanks PsyDAG and Steve