self Maths Puzzle

Find the number of selections and of arrangements that can be made by taking 4 letters from the word expression.

Read Solution (Total 3)

@ CTN,

What about repeating letters ???
12 years agoHelpfull: Yes(1) No(0)

10p4 = 10*9*8*7 = 5040
12 years agoHelpfull: Yes(0) No(1)
The number of arrangements may be 2694 but I am not sure.
10 years agoHelpfull: Yes(0) No(0)

self Other Question

Find the number, the second digit of which is smaller than its first digit by 4, and if the number was divided by the digit’s sum, the quotient would be 7. Three numbers are in the ratio 3:4:5 respectively.If the sum of first and third number is more than the second number by 52.Then which are these numbers?