If all 6 are replaced by 9,the algebric sum of all numbers from 1 to 100 (both inclusive)varies by,
Options:
A) 980	B) 330	C) 660	D) 990	E) 300

Rationale: 6 , 16,26 , 36,46 , 56,76 , 86,96 replace by 9 then 3 * 9 = 27 60,61 , 62,63 , 64,65 , 66,67 , 68,69 then increase by 30 i . e , 30 * 10 = 300 + 3 99 - 66 = 33 - 30 it will be 330 answer : b
Answer: B