Question

if the arithmetic mean of first n natural number is 100 ,than n is.
options.
1. 196
2. 197
3 . 198
4. 199
give answer with solution.​

Answer 1

Answer:

Correct option is

D

50.5

Arithmetic mean refers to the average amount in a given group of data. So arithmetic mean can be calculated by adding the first term and the last term of the series and then dividing the sum by 2. In the given series the first term is 1 and  the last term is 100, so the 

Arithmetic mean = ( 1+100 ) /2 

                             = 101 /2 

                             = 50.5 

Answer 2

Answer:

199 is the correct answer because the first n is 100 so the second n will be 199