Question

Find the sum of all integers which are exactly divisible by 7 between 250 and 550​

Answer 1

Answer:

17157

Step-by-step explanation:

[252, 259, 266, 273, 280, 287, 294, 301, 308, 315, 322, 329, 336, 343, 350, 357, 364, 371, 378, 385, 392, 399, 406, 413, 420, 427, 434, 441, 448, 455, 462, 469, 476, 483, 490, 497, 504, 511, 518, 525, 532, 539, 546]

sum of all these would result 17157

Answer 2

Step-by-step explanation:

252, 259 , ......546

Sn = n/2 [ F + L ] [ F = first term

L = last term ]

n = 36 to 78 = (78 - 36) + 1 = 43

[ 252/7 = 36 and 547/7 = 78 ]

Sn = 43/2 [ 252 + 546 ]

Sn = 43*399

Sn = 17,157

this problem has to be solved using Arithmetic progression formulae