The houses in a street are numbered using a pattern. Which of the following gives the door number of the fifth house from the left?

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Solution

The correct option is B 55
The numbers on the doors are 11, 22, 33, 44.

Let us find the rule of the pattern.

Difference between the 2nd term and the 1st term = 22 - 11 = 11

Difference between the 3rd term and the 2nd term = 33 - 22 = 11

Therefore, 11 must be added to get the consecutive terms.

Hence, the next number in the sequence is 44 + 11 = 55

Hence, the door number of the 5th house from the left is 55.

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