Number Series

1.1, 9, 25, 49, ?, 121. What will come at the place of question mark ?

1. 100
2. 91
3. 64
4. 81

Answer:Option 1

Explanation:

Solution:

1² = 1.
3² = 9.
5² = 25.
7² = 49.
9² = 81.
11² = 121.

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2.4, 7, 12, 19, 28, ?

1. 49
2. 36
3. 30
4. 39

Answer:Option 1

Explanation:

Solution:

First term,
4
Second,
4+3 = 7.
Third,
7+5 = 12.
Fourth,
12+7 = 19.
Fifth,
19+9 = 28.
Therefore,
28+11 = 39 will be the required term.

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3.6, 11, 21, 36, 56, ?

1. 91
2. 51
3. 81
4. 42

Answer:Option 1

Explanation:

Solution:

6 (+5)→ 11 (+10)→ 21 (+15)→ 36 (+20)→ 56 (+25) → 81.

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4.8, 28, 116, 584, ?

1. 1752
2. 3504
3. 3508
4. 3502

Answer:Option 1

Explanation:

Solution:

(8 *3) + 4 = 28 (28 *4) + 4 = 116 (116 *5) + 4 = 584 (584 *6) + 4 = 3508.

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5.3, 7, 23, 95, ?

1. 62
2. 128
3. 479
4. 575

Answer:Option 1

Explanation:

Solution:

1st number = 3
2nd number = 3 x 2 +1 = 7
3rd number = 7 x 3 + 2 = 23
4th number = 23 x 4 + 3 = 95
5th number = 95 x 5 + 4 = 479

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6.7, 26, 63, 124, 215, 342, ?

1. 391
2. 511
3. 481
4. 421

Answer:Option 1

Explanation:

Solution:

The terms are given in a series
(2³ -1) = 7
(3³ -1) = 26
(4³ -1) = 63
(5³ -1) = 124
(6³ -1) = 215
(7³ -1) = 342
So, the missing term is,
(8³ -1) = 511.

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7.165, 195, 255, 285, 345, ?

1. 390
2. 420
3. 435
4. Two answer out of four option

Answer:Option 1

Explanation:

Solution:

Solution 1: Each number of given series is 15 multiplied by a prime number.
15*11, 15*13, 15*17, 15*19, 15*23.
So, Missing number is
15*29 = 435.

Solution 2: This pattern is +30 and then +60 also follow for the give series.
165+30=195,
195+60=255,
255+30=285,
285+60=345,
345+30=375

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8.3, 2, 7, 6, 11, ?

1. 8
2. 10
3. 4
4. 2

Answer:Option 1

Explanation:

Solution:

2^nd number is less by 1 than the 1^st number and 3^rd number is more by 5 than the 2^nd number. The same rule follows in other numbers of the series.

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9.In the following number series a wrong number is given. Find out the wrong number.
150, 450, 750, 1060,1350,1650,1950