Question

If the sun of guest 20 even natural number is equal to I time the sum of first 20 odd natural numbers, then k is equal to:

Answer 1

Step-by-step explanation:

let x and y be the sum of first 20 even and odd numbers respectively.

Now,

Sum of first 20 even numbers is given by ,

x = 10[4 + 38] (BY USING THE SUM FORMULA FOR AP)

= 420

Sum of first twenty odd numbers is given by,

y = 10[2 + 38]

= 400

we know,

x = ky

k = x/y

= 420/400

= 1.05