Question

In a MCQ TEST comprising of 5 questions each with 4 answers. How many a student can “guess” an answer?
a) 25
b) 50
c) 625
d) 120

Answer 1

could you clarify the question?

Answer 2

its 5*4!
number of question* probability of choices.

Answer 3

its actually an SAT question i got i thought the answer was 20 but they dont seem to think so in their choices

Answer 4

"How many a student can 'guess' an answer" can you clarify this? some data seems to be missing

Answer 5

oh yeah how many answers can a student guess sorry about that

Answer 6

im thinking this is a combination question

Answer 7

use \[\frac{5!}{(5-4)!}\]

Answer 8

@theyatin is correct 5*4! is 120

Answer 9

thank you arch its 5*4c1= 5*4!=5*4*3*2*1=120

Answer 10

u mean like 5 multiplied by 4 ?

Answer 11

\[5 \times 4! \implies 5 \times 4 \times 3 \times 2 \times 1\]

Answer 12

nope 5*4!
and 4!=4*3*2*1
so it will be 5*4*3*2*1=120

Answer 13

oh ok yeah i got it ...

Answer 14

that's what i wrote too anyway lol \[\frac{5!}{(5-4)!} \implies \frac{5!}{1!} \implies 5! \implies 5 \times 4 \times 3\times 2 \times 1\]

Answer 15

i thought its 4^5. but its not evern there in options... nvm

Answer 16

is this part of algebra?

Answer 17

yup

Answer 18

http://en.wikipedia.org/wiki/Combination

Answer 19

gee thanx p'ple

Answer 20

wiki puts it in a complicated form but it's really just \[nCr \implies \frac{n!}{r!(n-r)!}\] lol

Answer 21

right i'll try and understand it :)