Question

12. Without adding, find the sum :
(i) 1 + 3 + 5 + 7​

Answer 1

Answer:25

Step-by-step explanation:sum of first n odd no.=n^2

                        total consecutive odd no.=5

                                      thus n = 5

 thereforce sum=n^2

                          = 5^2

                           = 25

Answer 2

Answer:

16

Step-by-step explanation:

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