A hint to get started
Distinguish nine-digit integers from nine-position binary strings
(a) How many different nine-digit numbers can be formed from five 0 s and four 1 s such that no three 0 s are together? marks
(b) Six people sit at a round table with eight identical chairs. Find the number of seating arrangements if
(i) there are no restrictions, marks
(ii) the seats are numbered. mark
[2011/TPJC/II/6]
CJC · Review problems · Question 5
Check whether the leading-zero convention is stated before counting digit strings.