1 to 150 is 151 x 75. work that out then deduct 10 (for 1 - 4)
They are: 49+50+51 = 150
The answer is -5.
-4 and -5
Zero (0).
The formula to sum a series of numbers is: sum = 1/2 x number_of_numbers x (first_number + last_number) So to sum the integers 5 to 500: From 5 to 500 there are 500 - 5 + 1 = 496 integers, so sum = 1/2 x 496 x (5 + 500) = 125240
Find the sum of the first 11 terms in the sequence 3 7 11
5 & 10
The numbers are 148, 150 and 152.
They are: 148+150 = 298
-4 and -1
The integers are -7 and -5.
It need not be. 2 and 3 are consecutive integers and their sum is 5, not 31.