Question

find the sum of 11+13+15+... using the property that the sum of the first n odd natural numbers is n2
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Answer 1

Answer:

n²-25

Step-by-step explanation:

11+13+15+... up to n terms

= (1+3+5+7+... n terms) - (1+3+5+7+9)

= n² - 5²

= n² - 25