SNAP Number Series Questions

24 + 2 .5 = 26.5
26.5 - 5 = 21.5
21.5 + 7.5 = 29
29 - 10 = 19
19 + 12 .5 = 31.5
Hence, option C is the right answer.

14 = 13*1+1
26 = 14*2-2
81 = 26*3+3
320 = 81*4-4
320*5+5 = 1605

27 is the incorrect term in the given series and hence, option C is the right answer. 

$$1 \times 2 - 3 = -1$$
$$2 \times 3 - 4 = 2$$
$$3 \times 4 - 5 = 7$$
$$4 \times 5 - 6 = 14$$
$$5 \times 6 - 7 = 23$$
$$6 \times 7 - 8 = 34$$

The pattern in the given series is
$$1^{3} + 2 = 3$$
$$2^{3} + 3 = 11$$
$$3^{3} + 4 = 31$$
$$4^{3} + 5 = 69$$
$$5^{3} + 6 = 131$$
Hence the next term will be
$$6^{3} + 7 = 223$$

5, 9, 16, 29, 54,__, ?

5x2-1=9

9x2-2=16

16x2-3=29

29x2-4=54

54x2-5=103

103x2-6=200

Answer 200

16, _ , 68, 88 

The mirror image of each sequence will be 

19, __ , 98, 88 

Invert the digits

91, __, 89, 88

90 inverted digits will be 06.

The pattern is followed as:

Prime numbers multiplied by a number before that, i.e.,

2*1, 3*2, 5*4, 7*6, 11*10

So, the next number has to be 13*12, which is 156. 

In the 3rd row, the second element i.e. 4 comes as the product of the 2's in the row above. Similarly, second element of the 4th row i.e. 8 comes as the product of the 2 and the 4 above it.

Using this pattern, the 3 '?' will be 8, 1024 and 32.

The sequence that is followed is 4, 4*8=32, 32*9=288, 288*10=2880, 2880*11= 31680.

In the patter we observe $$\ \frac{product\ of\ number\ in\ traigle\ }{product\ of\ number\ in\ sqaure\ and\ circle}\ =\ \ \frac{\ 6\times\ 8}{12\times\ 8}=\ \frac{\ 5\times\ 6}{6\times\ 10}=\ \frac{\ 1}{2}$$

Let the missing number be $$N$$

$$\ \frac{\ 3\times\ 12}{4\times\ N}=\ \frac{\ 1}{2}$$

$$N=18$$