Question
How many strings of six lowercase letters from the English alphabet contain a) the letter a? b) the letters a and b in consecutive positions
How many strings of six lowercase letters from the English alphabet contain
a) the letter a?
b) the letters a and b in consecutive positions with a preceding b, with all the letters distinct?
c) the letters a and b, where a is somewhere to the left of b in the string, with all the letters distinct?
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An Introduction to the Mathematics of financial Derivatives
Authors: Salih N. Neftci
2nd Edition
978-0125153928, 9780080478647, 125153929, 978-0123846822
