What is the sum of natural numbers from 11 to 40?(1) 820 (2) 765 (3) 355 (4) 610
Answers
Answered by
7
Sum of natural numbers till n = n(n+1)/2
Sum of natural numbers till 10 = 10(10+1)/2
= 10(11)/2
= 55
Sum of natural numbers till 40 = 40(40+1)/2
= 20(41)
= 820
Sum of natural numbers from 11 to 40 = 820-55
= 765
Hence, (2) 765 is the answer.
Hope it Helps!!!
Please mark as Brainliest!!!
Answered by
0
Answer:
sum of n natural numbers is given by the formula S = n(n+1)/2
S (11 to 40) = S (1 to 40) - S (1 to 10)
=> (40 × 41)/2 - (10 × 11)/2
=> 820 - 55
=> 765
Similar questions