Math, asked by niteshshaw723, 5 months ago

please answer this question ​

Attachments:

Answers

Answered by tennetiraj86
4

Answer:

\huge{\boxed{\rm{\blue{answer=(7n-1)/2}}}}

Step-by-step explanation:

Used formulae:-

Sum of first "n" natural numbers=n(n+1)/2

Attachments:
Similar questions