3
6
8
9
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Answer : Option C
Explanation :
Each term in the series is the product of the digits of the preceding term.So, missing term = 1 x 8 = 8.
117
121
123
129
Clearly, 3 + 6 = 9, 9 + 6 = 15,.....So, the series is an A.P. in which a = 3 and d = 6.Therefore 21st term = a + (21 - 1) d = a + 20d = 3 + 20 x 6 = 123.
32
34
38
40
Answer : Option B
The pattern is + 5, - 2, + 5, - 2,.....So, missing term = 36 - 2 = 34.
100
112
144
The series consists of squares of consecutive odd numbersi.e. 12, 32, 52, 72, 92,.....So, missing term = 112 = 121.
64
81
91
The given series consists of squares of consecutive odd numbersi.e. 12, 32, 52, 72,.....So, missing term = 92 = 81.
49
50
51
52
Answer : Option D
The pattern is + 0, + 3, + 8, + 15, ..... i.e. + (l2 - 1), + (22 - 1), + (32 - 1), + (42 - 1), .....So, missing term = 28 + (52 - 1) = 28 + 24 = 52.
20
23
24.
25
The pattern is + 2, + 6, + 6, + 10, + 10,.....So, missing term = 14 + 10 = 24.
130
140
150
160
The pattern is + 4, + 9, + 16, + 25, + 36, ..... i.e. + 22, + 32, + 42, + 52, + 62,.....So, missing term = 91 + 72 = 91 + 49 = 140.
48
346
574
1003
The given series consists of numbers each of which, on dividing by 7, leaves aremainder 3. No other number except 346 satisfies the property.
180
240
420
480
The pattern is ÷ 1, ÷ 2, ÷ 3, ÷ 4, ÷ 5.So, missing term = 240 ÷ 1 = 240.
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