Find the greatest number that exactly divides 35, 91 and 840?
Options:
A) 5	B) 6	C) 7	D) 8	E) 9

Rationale: "the greatest number that exactly divides 35 , 91 and 840 is the hcf of the three numbers . so , calculating hcf we get the answer 7 . answer : c"
Answer: C