Doubt

1. Product of the roots = c/a= 1

So,

p/5= 1

p= 5 

3. (nq)^1/2

please clarify question no.3

and question no.2 also.........................

n,p,q are in GP

So common ratio is same fr all consecutive terms..

So,

p/n= q/p

p^2= nq

p= (nq)^1/2

Are there was some formula for q.2 ... i am unable to recall it at the moment...I will revert if i get the answer...
 

U can ask me any doubt u have in CPT...

please anyone can solve my query as i am facing problem in it as swati

Q/ Find out the coofficient of correlation between X and Y by the rank cofficient method

X      75              88           95         70        60        80         81         50

Y    120           130          130       115       110      140      142       100

Q.2 No of Diagonals of a polygon = n(n-3)/2, n=no of sides

And ur decagone has 10 sides

So No of diagonals=10(10-3)/2=35

Mono = 1

Di = 2

Tri = 3

Tetra = 4

Penta = 5

Hecza = 6

Hepta = 7

Octa = 8

Nena = 9

Deca = 10