Question

What is value of (1+3+5+7+...+4033)missing numbers?

Answer 1

the correct answer is 4049.

Answer 2

Answer:

The correct value is 4068289

Step-by-step explanation:

The given sequence is in A.P with common difference(d) = 2, First Term (a) = 1, Last Term (l) = 4033 , n= number of terms in A.P

So, to find sum of the given A.P we need to first find the number of terms

Using Formula for last term of an A.P :

$l=a+(n-1)\cdot d\\\\4033=1+(n-1)\cdot 2\\\\4032=(n-1)\cdot d\\\\\frac{4032}{2}=n-1\\\\\implies n=2017\\\\\text{Sum of n terms of A.P. : }S_n =\frac{n}{2}\times (a+l)\\\\S_n=\frac{2017}{2}\times (1+4033)\\\\S_n=1008.5\times 4034=4068289$