Question

the sum of successive odd numbers 1 ,3 ,5 ,7, 9 ,11, 13 is ​

Answer 1

Answer: as 1,3,5,7,9,11,13 and 15 form an ap

so sum= 8/2(2*1+(8-1)2)

{$\frac{n}{2}[2a+(n-1)d]$}    is the formula used

=4(2+14)

=4(16)

=64

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