Question

23. What is the sum of all odd terms from 1 to 51?
a) 625 b) 676 c) 2601 d) 576

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Answer 1

Answer:

676 is the correct answer means b

Answer 2

Answer:

The answer is (b) 676

Step-by-step explanation:

The odd terms are 1,3,5,7,......,51

Now first term(a) =1

Difference( d) =3-1=2

Last term( l) =51

l=a+(n-1)d

51=1+(n-1)2

(50+2)/2=n

n=26

Now,

Sum(26)=(n/2)(a+l)

=(26/2)(1+51)

=13*52

=676