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# What is the sum of the odd numbers from 1 to 387?

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What is the sum of the odd numbers from 1 to 387?

Jun 15, 2018

#1
+1

[L - F] / D + 1=N, where L=Last term, F =First term, D=Common difference, N=No. of terms.

[387 - 1] / 2 + 1 = 194 terms

Sum = [F + L] / 2 x N

Sum =[1 + 387] / 2 x 194

Sum = / 2 x 194

Sum = 194 x 194

Sum =37,636

Jun 15, 2018

#1
+1

[L - F] / D + 1=N, where L=Last term, F =First term, D=Common difference, N=No. of terms.

[387 - 1] / 2 + 1 = 194 terms

Sum = [F + L] / 2 x N

Sum =[1 + 387] / 2 x 194

Sum = / 2 x 194

Sum = 194 x 194

Sum =37,636

Guest Jun 15, 2018
#2
+1

I wonder who could have posted this BLARNEY.

Who could it be? Now, let me tink about it ...

I know, I know!  It’s THE BLARNY BANKER! ... It’s THE BLARNY BANKER!

There are psychology texts describing visual comprehension: What a person doesn’t understand he cannot see, so he will see what he can understand.  The word, “see” in this context does not refer to comprehension it refers to literal vision.

You (usually) understand arithmetic and geometric progressions, so this is what you see.  It’s WRONG (here), but you see it clearly.

You see a minus sign, because that is what you understand, so that is what you use to “solve the problem. That is WRONG, too.

You should be pleased Mr. BB, I’ve used you (in context of your posts) in no less than four research papers: Cognitive learning, abnormal behaviors, analysis, and Learning curves: Statistical analysis by age groups – aka Teaching Old Blarney Bankers New Tricks.

For case examples, I refer to you as Mr. BB, instead of Mr. X.

GA

Jun 15, 2018
edited by GingerAle  Jun 16, 2018
#3
+1

What's wrong with the guest's answer?

Guest Jun 16, 2018
#4
+2

There is not a damn thing wrong with this answer. This is not Mr. BB. I trolled the wrong freaking post.  I’ve let him get under my skin. This is worse than fleas and mange mites, and I’m screwing up because of it.  Mr. BB isn’t a troll; he’s a cross between a gnome and a banshee, and he is an anonymous phage on here.

GA

Jun 16, 2018