Question

21. In the class intervals 15-25, 25-35, the number 25 is included in:
(a)15-25 (b)25-30 (c)both the interval (d) none of these intervals​

Answer 1

Answer:

25 -30

Step-by-step explanation:

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Answer 2

Answer:

The number 25 is included in both the interval.

Step-by-step explanation:

The number 25 falls in the range of the first interval 15-25, and it is also the lower limit of the second interval 25-35. Therefore, it is included in both the intervals.

So, option c is the correct answer.

Interval related more information:In mathematics, an interval is a set of real numbers that includes all the numbers between two given endpoints. The endpoints can either be included in the interval or excluded from it. Intervals are commonly used in many areas of mathematics, including calculus, analysis, and algebra.

There are four types of intervals: open intervals, closed intervals, half-open intervals, and degenerate intervals.

An open interval is an interval that does not include its endpoints. For example, the interval (0, 1) consists of all the real numbers between 0 and 1, but does not include 0 or 1 themselves. An open interval is denoted by placing parentheses around the endpoints, like (a, b).

A closed interval is an interval that includes its endpoints. For example, the interval [0, 1] consists of all the real numbers between 0 and 1, including 0 and 1 themselves. A closed interval is denoted by placing square brackets around the endpoints, like [a, b].

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