1) 6, 11, 21, 36, 56, ..
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Ans. A
Explanation :
Pattern is +5, +10, +15, + 20. So next will be 56+25 = 81
2) 5, 9, 17, 29, 45, ..
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Ans. C
Explanation :
Pattern in the series is +4, +8, +12, +16.
Next term will be 45 + 20 = 65
3) 20, 19, 17, (...) , 10
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Ans. D
Explanation :
Pattern in the series is -1, -2, .., .. , -5
So next term will be 17 - 3 = 14
4) 13, 35, 57, 79, 911
- 1) 1005
- 2) 1110
- 3) 1113
- 4) 1140
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Ans. C
Explanation :
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.
5) 4, 10, (?), 82, 244,
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Ans. B
Explanation :
Each number in the series is the preceding number multiplied by 3 and then decreased by 2.
6) In the series 3, 9, 15.. what will be the 21st ter
- 1) 123
- 2) 126
- 3) 129
- 4) 136
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Ans. A
Explanation :
We can judge that it is A.P.
With 6 as difference
nth term in A.P. = a+(n-1)d
a= 3, n = 21, d = 6
So, 21st term will be = 3+(20)6 = 123
7) In the series 2, 6, 18, 54, ... what will be the 8th term
- 1) 4174
- 2) 4150
- 3) 4274
- 4) 4374
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Ans. D
Explanation :
We can see the given series is in G.P.
as 2*3 = 6, 6*3 = 18, 18*3 = 54
So a = 2 , r = 3
nth term in G.P. is
\begin{aligned}
ar^{n-1} \= 2*3{8-1} \= 2*3^7 \= 2*2187 = 4374
\end{aligned}
8) 19, 2, 38, 3, 114, 4, ? . Which term should replace the question mark in this serie
- 1) 340
- 2) 380
- 3) 456
- 4) 486
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Ans. C
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
9) 3, 12, 27, 48, 75, 1
- 1) 141
- 2) 143
- 3) 145
- 4) 147
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Ans. D
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}
10) 2,15,41,80, ? . Complete the seri
- 1) 130
- 2) 132
- 3) 134
- 4) 136
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Ans. B
Explanation :
Pattern is +13,+(13*2), +(13*3)
Next will be +(13*4) = 80+52 = 132