Question

without actual multiplication , find the sum of 9+11+13+15+17+19+21+23+25


I need the explanation ​

Answer 1

Answer:

the answer is 153

Step-by-step explanation:

WKT

sum of first n odd no.s is n²

we need to find

9+11+13+15+17+19+21+23+25

that can be written as

1+3+5+7+9+11+13+15+17+19+21+23+25-(1+3+5+7)

13²-4²=(13+4)(13-4)

=17×9

=153

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