Question

Find the sum of 2+4+6_ _ _+200

Answer 1

Step-by-step explanation:

Here the no.s are in AP

a= 2

d=2

l=200

let no. of terms be n

l=a+(n-1)d

200=2+(n-1)2

100=1+n-1

n=100

so sum =n/2(a+l)

=50×202

=10100

Answer 2

Answer:

a= 2;d=4-2=2;an =200

an =a+(n-1)d

200 = 2 + (n-1)2

or,198= (n-1)2

or,198/2 =n-1

or,99=n-1

or, n =100

therefore,Sn =n/2(a+an)

=100/2(2+200)

= 50(202)

=10100(Ans)

Step-by-step explanation:

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