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If 1 + 2 + 3 + ... + n = 325, then what is n?

 Jan 22, 2021
 #1
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25=325 so n=25

 Jan 22, 2021
 #2
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The sum formula : n(n + 1)/2

n(n + 1)/2 = 325, so n(n + 1) = 650, so n = 25 

 

Edit: hope that helped

 Jan 23, 2021
edited by Guest  Jan 23, 2021

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