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Question
Find the missing number?
Options:
A .  2
B .  5
C .  1
D .  3
Answer: Option A
Working in rows, the sum of numbers in each row follows the sequence 5, 10, 15, 20, 15, 10, 5. So,
Sum of the middle = 20
1 + 3 + 7 + x + 1 + 4 + 2 = 20
x = 20 - 18 = 2.
Missing element = 2.
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