Question

the sum of 1st 'n'natural numbers is 45 find 'n' ?​

Answer 1

Answer:

The number series 1, 2, 3, 4, . . . . , 44, 45. Therefore, 1035 is the sum of positive integers upto 45.

Step-by-step explanation:

Hope it will help you friend.

Answer 2

Answer:

9

Step-by-step explanation:

1st 'n'natural numbers is 45 find 'n'

sum of n natural numbers=n(n+1)/2

45=​n(n+1)/2

45*2=n²+n

90=n²+n

n²+n-90=0

n²+10n-9n-90=0

n(n+10)-9(n+10)=0

(n+10)(n-9)=0

n=-10 (not defined)

n=9