Find would be the missing number in the series - 1, 20, ??, 266, 675
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1 , 20 , x , 266 , 675
(20-1) , (x-20) , (266-x) , (675-266)
19 , (x-20) , (266-x) , 409
(x-20-19) , (266-x-x+20) , (409-266+x)
(x-39) , (286-2x) , (143+x)
(286-2x-x+39) , (143+x-286+2x)
(325-3x) , (3x-143)
(3x-143-325+3x)
6x- 468
now,
6x - 468 = 0
6x = 468
x = 78
missing term is 78
(20-1) , (x-20) , (266-x) , (675-266)
19 , (x-20) , (266-x) , 409
(x-20-19) , (266-x-x+20) , (409-266+x)
(x-39) , (286-2x) , (143+x)
(286-2x-x+39) , (143+x-286+2x)
(325-3x) , (3x-143)
(3x-143-325+3x)
6x- 468
now,
6x - 468 = 0
6x = 468
x = 78
missing term is 78
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