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what is the sum of the first 30 odd numbers? How to calculate it without having to add all of them.

Sagot :

Ryan2
See that odd number are in a Aritmetic progression with a1 = 1 and r = 2

30th number of sequence is given by:

[tex]a_{30}=a_1+29r\\ \\ a_{30}=1+29*2\\ \\ a_{30}=59[/tex]

Now you can calculate the sun by:

[tex]S_{30}=\frac{30(1+59)}{2}=\frac{30*60}{2}=900[/tex]
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