We have duch equation
2a/3+1/5=7/6. /-1/5
2a/3=7/6-1/5
2a/3=35/30-6/30
2a/3=29/30. /*3
2a=29*3/30
2a=87/30. /:2
a=87/60
a=1 27/60
a=1 9/20 Its the result
This problem can be solved using the concepts of permutation.
Zzyzx is the word. It has five letters. It asked as to how many five-letter arrangements of the letters in the English alphabet follow Zzyzx alphabetically.
Take note: <span>alphabetically </span> The two remaining five-letter after Zzyzx are Zzyzy and Zzyzz. The remaining arrangements are of the form Zzz _ _. There are 26 × 26 = 676 ways to fill in the last two letters, so following Zzyzx alphabetically, there are 2 + 676 = 678 arrangements.
