Question

D.
(1)
reset answer
Sections
Q 19 Find the missing term in the series given below.
1
21, 28, 42, 63, ?, 126, 168
2.
Ops: A. 092
B. 091
C. O 119
3
D. 109
Q 20 Find the missing term in the series given below.
44, 47, 54, ?, 79,97
5
Ops: A. 070
B. O 68
65
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Answer 1

ANSWER:

1.(b) 91

2.(c) 65

HOPE IT HELPS YOU...

Answer 2

Q.19 - 91

Q.20 - 65

Given:

A) 21, 28, 42, 63, ?, 126, 168

B) 44, 47, 54, ?, 79,97

To find:

Missing number in both cases

Solution:

A)

Each number is a multiple of 7. The multiples are increasing by 1,2,3 and so on.. Like first 7 is multiplied by 3 then 4 then 6 then 9 and so on..

21 = 7*3

28 = 7*4(3+1)

42=7*6(4+2)

63 = 7*9(6+3)

? = 7*13 (9+4)

126 = 7*18(13+5)

168 = 7*24(18+6)

So, ? = 7*13 = 91

B)

The numbers are increasing by 3, 7 then 11, 14, 18.

44,47,54,?,79,97

47-44=3

54-47 = 7

79-54 = 25

97-79=18

? = 65

Q.19 - 91

Q.20 - 65

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