Question
(51 + 52 + 53 + ... + 100) = ?
Answer: Option D
Was this answer helpful ?
Sn = (1 + 2 + 3 + ... + 50 + 51 + 52 + ... + 100) - (1 + 2 + 3 + ... + 50)
=
100
x (1 + 100) -
50
x (1 + 50)
2
2
= (50 x 101) - (25 x 51)
= (5050 - 1275)
= 3775.
Was this answer helpful ?
More Questions on This Topic :
Question 2. (800 ÷ 64) x (1296 ÷ 36) = ?....
Question 4.
(489 + 375)2 - (489 - 375)2
= ?
(489 x 375)
....
Question 8.
(4300731) - ? = 2535618
....
Question 9. The sum of even numbers between 1 and 31 is:....
Latest Videos
Latest Test Papers
Submit Solution