Sum of 1 to 40 is?

Answer Posted / abhinav pratap

sum = n(n+1)/2
so, sum of 1 to 40 = 40(40+1)/2 = 20*21 = 820

Is This Answer Correct ?    2 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

Why RSD of area limit is 15?

1898


The main line train starts at 5.00AM and the harbor line train starts at 5.02AM. Each train has the frequency of 10 minutes.If a guy goes in the morning at a random time what is the probability of he getting main line train?

926


consider expression 'ab' . what happens when 'a' is divided by 'c' &'b' is multiplied by 'c'.

832


There are two candles with different thickness, but are of equal length. The thicker one lasts of six hours and the thinner candle last for 2 hours less than the thicker one. Suresh lights the two candles at the same time. When he went to bed he saw the thicker one is twice the length of the thinner one. For how long did Suresh light the two candles.

689


If a worker gets late for his work he has to pay a fine of Rs 200 on the first day and the fine increases by 25 Rs per day. If he pays a total amount of Rs 9450, for how many days did he pay for?

733






If 4 circles of equal radius are drawn with vertices of a square as the center, the side of the square being 7 cm, find the area of the circles outside the square?

718


I and two of my friends were playing a game. For each win I get Rs 3. Totally I had three wins. Player 2 got Rs.9 and player 3 got Rs 12. How many games had been played?

1500


A sum of money doubles itself in 4 years at simple interest, in how many years, it would become 7 times of itself?

788


Find the smallest number which leaves 22,35, 48 and 61 as remainders when divided by 26, 39, 52 and 65 respectively.

1287


I bought a car with a peculiar 5 digit numbered licence plate which on reversing could still be read. On reversing value is increased by 78633. Whats the original number if all digits were different?

898


Q1. Given a collection of points P in the plane, a 1-set is a point in P that can be separated from the rest by a line, .i.e the point lies on one side of the line while the others lie on the other side. The number of 1-sets of P is denoted by n1(P). The minimum value of n1(P) over all configurations P of 5 points in the plane in general position(.i.e no three points in P lie on a line) is

1831


Delhi's population is increasing day by day what is the reasong behind it & how can we solve it. G.D QUESTION (amit_nirwan@yahoo.com)

2274


A person has Rs 100/- in his pocket, he can as 25 pencils or 15 books. He kept 15% of the money for travelling expenses and purchased 5 pencils. So how many books he can purchase with the remaining money.

855


If a car starts from A towards B with some velocity due to some problem in the engine after travelling 30km.If the car goes with 4/5 th of its actual velocity the car reaches B 45min later to the actual time. If the car engine fails after travelling 45km, the car reaches the destination B 36min late to the actual time , what is the initial velocity of car and what is the distance between A and B in km

732


the sum of the present ages of a father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be?

706