Question

find the sum of all natural numbers between 11 to 30 include them​

Answer 1

Step-by-step explanation:

Please refer to the above attachment for the answer

Answer 2

Answer:

Sum of all natural numbers between 11 and 30 = 410

Step-by-step explanation:

Numbers between 11 and 30 are in A.P: 11 ,12...30

a= 11; an= 30; d=1

a+(n-1)d= an

=>11 + n - 1= 30

=>n =31-11

=>n = 20

Sn= n/2(a + an)

S20= 10(11+30)

S20= 110 + 300

S20= 410