• 15. 19, 2, 38, 3, 114, 4, ? . Which term should replace the question mark in this series ?

1. 340
2. 380
3. 456
4. 486

Explanation:

Please check the given sequence is combination of two series.
Series 1: 19, 38, 114, ...
Series 2: 2,3,4

In series 1, Pattern followed is *2, *3, so next will be *4
Next term will be
114*4 = 456

• 16. 36, 34, 30, 28, 24, ... What number should come next?

1. 22
2. 20
3. 18
4. 16

Explanation:

Pattern in the series is, -2, -4, -2, -4. So next term will be -2
24 -2 = 22

• 17. 3, 12, 27, 48, 75, 108,

1. 141
2. 143
3. 145
4. 147

Explanation:

Series is having pattern
\begin{aligned}
3*1^2, 3*2^2, 3*3^2, ......\\
\text{Next will be } 3*7^2 = 147
\end{aligned}

• 18. 2,15,41,80, ? . Complete the series.

1. 130
2. 132
3. 134
4. 136

Explanation:

Pattern is +13,+(13*2), +(13*3)
Next will be +(13*4) = 80+52 = 132

• 19. 8, 10, 14, 18, (...), 34, 50, 66

1. 20
2. 24
3. 26
4. 28

Explanation:

Patten is +2, +4, +4, .., .., +16, +16

Missing number will be 18+8 = 26

• 20. 1,2,6,24, ?

1. 110
2. 118
3. 120
4. 122

Explanation:

Pattern is *2, *3, *4
So next number is the series will be *5
24*5 = 120

• 21. Complete the series 95, 115.5, 138, ..., 189

1. 160.5
2. 162.5
3. 164.5
4. 166.5

Explanation:

Pattern in the series is, +20.5 , +22.5,
Next will be +24.5
138 + 24.5 = 162.5