Question

find the sum of integers which are divisible by 2 from 11 to 50

Answer 1

Hey friend...

Here is your answer...

Sum=n/2(a+l)

Here, n=20

a=12

l=50

Sum=20/2(12 + 50)

=10*62

=620

HOPE that it will help you.....

Answer 2

hey

a = 12

d = 2

an = 50

an = a + (n-1)d

50 = 12 + (n-1)2

50 - 12 = (n-1)2

38/2 = n-1

n = 19 + 1

n = 20

sn = n/2 {a+an}

s20 = 20/2 {12+50}

= 10 {62}

= 620