What is the sum of first 40 terms of 1+3...

What is the sum of first 40 terms of `1+3+4+5+7+7+10+9+`...?
`1+3+4+5+7+7+10+9+`....के प्रथम 40 पदों का योग क्या है?

A

1010

B

1115

C

1030

D

1031

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The correct Answer is:

C

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