Math, asked by sandeepkansahoo, 1 month ago

39) The sum of first n natural numbers is given by the
expression 1/2 n2 + 1/2 n. What is the sum of natural
numbers starting from 9 and ending with 20, inclusive of
both 9 and 20?
A) 144
B) 156
C) 174
D) 192

Answers

Answered by rishabhraj121

5

Answer:

Rishabh Raj

Step-by-step explanation:

the sum of first natural number is 2 by 1 one by two x degree by answer is d

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