Question

10) What is the sum of
first 90 natural
numbers? ​

Answer 1

Answer:

The number series 1, 2, 3, 4, . . . . , 89, 90. Therefore, 4095 is the sum of positive integers upto 90.

Answer 2

Answer:

hey!!! there is your answer #brainliest

Step-by-step explanation:

a=1

d=1

an=90

n=90

sum of the 90 natural number = n/2(a+an)

                                                  =  90/2(1+90)

                                                  =  45(91)

                                                  =  4095