Question

The sum of successive od numbers 1,3,5,7,9,11,13 and15 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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