Question

What is the sum of all odd numbers from 101 to 309?​

Answer 1

Answer:

SOLUTION: if we write the numbers from 101 to 309 what is the sum of all the even numbers. = 21320. Answer. The sum under the question is 21320.

Answer 2

Step-by-step explanation:

a^1 = 101

a^n = 309

d = 2

a^n = a^1+(n-1)d

309=101+(n-1)2

309-101=2n-2

208+2=2n

n=210/2

n=105

S^n=n/2(a^1+l)

S^105=105/2(101+309)

S^105=105/2(410)

S^105=43050/2

S^105= 21525