45 - [45 - {25 - (8 - 4)}]

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-21

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Solution

The correct option is A
21

45 - [45 - {25 - (8 - 4)}]

= 45 - [45 - {25 - 4}] [Simplifying small brackets i.e ()]

= 45 - [45 - 21] [Simplifying curly brackets i.e {}]

= 45 - 24 [Simplifying square brackets i.e []]

= 21

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Similar questions

Class Interval	$5 - 10$	$10 - 15$	$15 - 25$	$25 - 45$	$45 - 75$
Frequency	$6$	$12$	$10$	$8$	$15$

25 - 45

Class interval:	25−35	35−45	45−55	55−65	65−75
Frequency:	6	10	8	12	4

Calculation (i) Arithmetic Mean and (ii) Standard Deviation for the following frequency distribution.

Class Interval

Frequency

20 – 25

25 – 30

30 – 35

35 – 40

40 – 45

45 – 50

N = 50

Size of item	$10 - 15$	$15 - 20$	$20 - 25$	$25 - 30$	$30 - 35$	$35 - 40$	$40 - 45$	$45 - 50$
No. of items	$4$	$8$	$18$	$30$	$20$	$10$	$5$	$2$

\frac{4^{5} + 4^{5} + 4^{5} + 4^{5}}{2^{5} + 2^{5}} \times \frac{6^{5} + 6^{5} + 6^{5} + 6^{5} + 6^{5} + 6^{5}}{3^{5} + 3^{5} + 3^{5}} = 8^{n}

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