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Fundamental Principle of Counting

10, 18, 28, 4...

Question

10, 18, 28, 40, 54, 70, ?

A

85

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B

86

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C

87

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D

88

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Solution

The correct option is B 88
The pattern is + 8, + 10, + 12, + 14, .....
So, missing term = 70 + 18 = 88.

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10, 18, 28, 40, 54, 70, ?

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

10, 18, 28, 40, 54, 70, ?

Q. Find the mean marks from the following data:

Marks	No. of students
Below $10$	$4$
Below $20$	$10$
Below $30$	$18$
Below $40$	$28$
Below $50$	$40$
Below $60$	$70$

Marks	Frequency	Cumulative Frequency
0-10	2	2
10-20	8	10
20-30	12	22
30-40	18	40
40-50	28	68
50-60	22	90
60-70	6	96
70-80	4	100

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Class interval	$0 - 10$	$10 - 20$	$20 - 30$	$30 - 40$	$40 - 50$	$50 - 60$	$60 - 70$	$70 - 80$
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