7 9 17 8 10 21
30 50 ?
4 5 6 3 3 6

Question

7    9      17      8      10      21
  30            50                ?
4    5       6       3        3        6

Akhil Tanakala · Answer

The actual question is 7,9,(30),4,5; 17,8,(50),6,3; 10,21,(?)6,3
Now consider the 1st block
1. 7,9,(30),4,5
The expression is
2(7+9+4+5)-(4x5)
2(25)-20
50-20=30
Similarly,
2. 17,8,(50),6,3
2(17+8+6+3)-6x3
68-18=50

Now, 10,21,(?)6,3
2(10+21+6+3)-(6x3)
80-18
=62

7 9 17 8 10 21 30 50 ? 4 5 6 3 3 6

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