Question

What will be the sum of all odd whole numbers between 10 and 38?

Answer 1

Answer:

11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38

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Answer 2

t =11+(n-1)2

37-11=(n-1)2

26/2=(n-1)

13+1=n

14=n

(where a=11;d=2;t=37)

S(14)=14/2[2*11+(14-1)2]

S(14)=7[22+26]

S(14)=7(48)

S(14)=336

336 is the answer