How many 4 letter permutations can be made from the set (o, r,a, n,g, e) so that they all start with the letter o, and repetition of a letter is not allowed?

cbnygjdyj

step-by-step explanation:

christopher is 272,195 year old

step-by-step explanation:

image for option 4

step-by-step explanation:

i just know the internet

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0