Question

the sum of 9 consecutive natural is 81 what are the numbers​

Answer 1

First nine consecutive odd numbers are 1, 3, 5, 7, 9, 11, 13, 15 and 17.

Sum of first nine consecutive odd numbers = 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 = 81

Answer 2

given data is in the form of AP

here,n=9,d=1

Sn=n/2 {2a+(n-1)d}

S9=81

9/2 {2a+(9-1)1}=81

9/2 {2a+8}=81

2a+8=81 x (2/9)

2a+8=18

2 a=18-8

2a=10

a=10/2

a=5

AP:5,6,7,8,9,10,11,12,13

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