Question

5+7+9+...+75

How to do this Arithmetic Series???​

Answer 1

Answer:

96

Step-by-step explanation:

5+7=21

21+75=96

Answer 2

Answer:

1440

Step-by-step explanation:

Here a = 5 , l= 75 and d = 7-5 = 2

formula : l= a + (n-1) d

so 75 = 5 + (n-1)2

75= 5+2n-2

75=2n+3

2n=75-3=72

n=72/2=36

formula : S= n/2 (a + l )

=36/2 (5+75)

=18×80

=1440

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