Question

while adding the first few continous natural numbers, a candidate missed one of the number and wrote the answer as 177. what was the number missed ?

Answer 1

find the first triangular number after 177, and subtract 177 from that

Answer 2

Begin with an equation(let K be the number for now):

n(n+1)/2-k=177

13=k

I can give you more information if you need it, but that seems like a pain.

Answer 3

^^ that works too

Answer 4

okeyplezsend more details @confusionist

Answer 5

HINT: the sum of the first 19 numbers =19(19+1)/2=190

Answer 6

well, excluding 0

Answer 7

I assume you just want to know how to do the equation: n(n+1)/2-k=177 now? Is that what you mean by more information?

Answer 8

yesss

Answer 9

@inkyvoyd I'm having trouble doing this without my tablet pen. Mind if you go ahead and solve this? Sorry, I'm glitchy today. x_x

Answer 10

@suman2335 , as @ganeshie8 said, you want to find the largest smallest value of n that is greater than 177. after trial and error, you will find that for n=19, you get a value of 190. In other words, the sum of 1+2+3+4+...+19=190. Thus, you know that 190-k=177. Solving for k, you get k=13.

Answer 11

thanks