Find the Largest Coefficient in the Expansion Of $( x + 3 ) ^ { 5 }$

Q30: Find the number of permutations of the

Q31: How many permutations of the seven letters

Q32: Using the ordinary alphabet and allowing repeated

Q33: How many ways are there to select

Q34: How many different strings can be made

Q36: suppose that a "word" is any string

Q37: How many 8-element DNA sequences contain exactly

Q38: A club with 20 women and 17

Q39: Using the ordinary alphabet and allowing repeated

Q40: Using the ordinary alphabet and allowing repeated