Tom found the room, in which one of his enemies is staying, he has to fight with his enemy and get information about the next destination. To unlock the door, Tom has to enter a one-digit number in two chances, which is the answer of the question displayed in the computer,
"If 0.36 = 3 × 10^a + 6× 10^b, then a× b is equal to”
What would have been the number entered by Tom if he broke the lock in the first attempt?

-2

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Solution

The correct option is B 2
0.36 = 3 × 10^-1 + 6× 10^-2
a = -1 and b = -2
ab = (-1)(-2) = 2

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The correct option is B 20.36 = 3 × 10-1 + 6× 10-2a = -1 and b = -2ab = (-1)(-2) = 2

The correct option is B 2
0.36 = 3 × 10^-1 + 6× 10^-2
a = -1 and b = -2
ab = (-1)(-2) = 2