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Q.

Choose the correct option.
How many 2-digit numbers are there?

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a

89

b

90

c

99

d

80

answer is B.

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Detailed Solution

The 2-digit numbers start from 10 and end at 99

We know, the number of natural numbers between 'a' and 'b' are (a – b) + 1

Number of 2-digit numbers = (99 – 10) + 1 

                                         = 90

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Choose the correct option.How many 2-digit numbers are there?