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

Answers

Answer 1

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

30th number of sequence is given by:

$a_(30)=a_1+29r\n \n a_(30)=1+29*2\n \n a_(30)=59$

Now you can calculate the sun by:

$S_(30)=(30(1+59))/(2)=(30*60)/(2)=900$

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so bro 7/28 =.25 what number will we need to use to make 25/x this number is 100

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