In the series 3, 9, 15, ...... what will be the 21st term?
SOLUTION ANALYSIS
Correct Option: C
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.
Question 2 of 20
Hint
1, 5, 14, 30, 55, 91, ?
SOLUTION ANALYSIS
Correct Option: B
The pattern is + 4, + 9, + 16, + 25, + 36, ..... i.e. + 22, + 32, + 42, + 52, + 62,.....
So, missing term = 91 + 72 = 91 + 49 = 140.
Question 3 of 20
Hint
48, 24, 96, 48, 192, ?
SOLUTION ANALYSIS
Correct Option: C
The pattern is ÷ 2, x 4, ÷ 2, x 4, .....
So, missing term = 192 ÷ 2 = 96.
Question 4 of 20
Hint
1, 9, 25, 49, ?, 121
SOLUTION ANALYSIS
Correct Option: B
The given series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72,.....
So, missing term = 92 = 81.
Question 5 of 20
Hint
240, ?, 120, 40, 10, 2
SOLUTION ANALYSIS
Correct Option: B
The pattern is ÷ 1, ÷ 2, ÷ 3, ÷ 4, ÷ 5.
So, missing term = 240 ÷ 1 = 240.
Clearly, 90 = 30 x 3, 180 = 6 x 30, 12 = 2 x 6, 50 = 25 x 2, 100 = 4 x 25, 200 = 50 x 4.
So, missing term = 3 x 50 = 150.
Question 7 of 20
Hint
0, 2, 8, 14, ?, 34
SOLUTION ANALYSIS
Correct Option: C
The pattern is + 2, + 6, + 6, + 10, + 10,.....
So, missing term = 14 + 10 = 24.
Question 8 of 20
Hint
3, 15, ?, 63, 99, 143
SOLUTION ANALYSIS
Correct Option: B
The terms of the given series are (22 - 1), (42 - 1),....., (82 - 1), (102 - 1), (122 - 1).
So, missing term = (62 - 1) - (36 - 1) = 35.
Question 9 of 20
Hint
1, 4, 10, 22, 46, ?
SOLUTION ANALYSIS
Correct Option: C
The pattern is + 3, + 6, + 12, + 24,.....
So, missing term = 46 + 48 = 94.
Question 10 of 20
Hint
13, 35, 57, 79, 911, ?
SOLUTION ANALYSIS
Correct Option: C
The terms of the given series are numbers formed by joining together consecutive
odd numbers in order i.e. 1 and 3, 3 and 5, 5 and 7, 7 and 9, 9 and 11, .....
So, missing term = number formed by joining 11 and 13 = 1113.
Question 11 of 20
Hint
2, 15, 41, 80, ?
SOLUTION ANALYSIS
Correct Option: D
The pattern is + 13, + 26, + 39,.....
So, missing term = 80 + 52 = 132.
Question 12 of 20
Hint
28, 33, 31, 36, ?, 39
SOLUTION ANALYSIS
Correct Option: B
The pattern is + 5, - 2, + 5, - 2,.....
So, missing term = 36 - 2 = 34.
Question 13 of 20
Hint
In the series 10, 17, 24, 31, 38,.....which of the following will be a number of the series ?
SOLUTION ANALYSIS
Correct Option: B
The given series consists of numbers each of which, on dividing by 7, leaves a
remainder 3. No other number except 346 satisfies the property.
Question 14 of 20
Hint
13, 32, 24, 43, 35, ?, 46, 65, 57, 76
SOLUTION ANALYSIS
Correct Option: C
The given sequence is a combination of two series:
I. 13, 24, 35, 46, 57 and II. 32, 43, ?, 65, 76
The pattern in both I and II is + 11. So, missing term = 43 + 11 = 54.
Question 15 of 20
Hint
22, 24, 28, ?, 52, 84
SOLUTION ANALYSIS
Correct Option: A
The pattern is + 2, + 4, + 8, + 16,.....
So, missing term = 28 + 8 = 36.
Question 16 of 20
Hint
6, 11, 21, 36, 56, ?
SOLUTION ANALYSIS
Correct Option: C
The pattern is + 5, + 10, + 15, + 20, ...
So, missing term = 56 + 25 = 81.
Question 17 of 20
Hint
66, 36, 18, ?
SOLUTION ANALYSIS
Correct Option: C
Each term in the series is the product of the digits of the preceding term.
So, missing term = 1 x 8 = 8.
Question 18 of 20
Hint
1, 9, 25, 49, 81, ?
SOLUTION ANALYSIS
Correct Option: C
The series consists of squares of consecutive odd numbers
i.e. 12, 32, 52, 72, 92,.....
So, missing term = 112 = 121.
Question 19 of 20
Hint
563, 647, 479, 815, ?
SOLUTION ANALYSIS
Correct Option: D
The pattern is + 84, - 168, + 336,.....i.e. + 84, - (84 x 2), + (84 x 22), .....
So, missing term = 815 - (84 x 23) = 815 - 672 = 143.
Question 20 of 20
Hint
2, 2, 5,13, 28, ?
SOLUTION ANALYSIS
Correct 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.
