(1), (2,3), (4,5,6), (7,8,9,10)....what is the sum for the 99th equation?

Each subsequent equation adds 1 number -- when you reach the 99th equation, what is the sum?  What is the formula for calculating this?
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1 Answer

eech 1=arithmetik sequens

I projekt the 99th will hav 99 as first term & hav 99 terms init

sum av NE sequens=n*(start number + last number)/2

n=99

start number=99

last number=start number+(n-1)*stepsize; stepsize=1 heer

last number=2*99=198

start+last=296

n*(start+last)/2=99*148=14,652
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