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Roop Singh meena

· started a discussion

· 1 Months ago

s (Question:925080.1)

solution bhejo

Question:
DIRECTIONS: What will come in place of  question mark (?) in the given number series? 
15, 31, 27, 52, 43, 44, ?
Options:
A) 49
B) 45
C) 57
D) 60
E) 44
Solution:
Ans: (e) 15 + (1 – 5)2 = 31

31 – (3 – 1)2 = 27

27 + (2 – 7)2 = 52

52 – (5 – 2)2 = 43

43 + (4 – 3)2 = 44

Hence, next number of series will 44 – (4 – 4)2 = 44

Knowledge Expert

· commented

· 1 Months ago

Dear student
Here the pattern is;
Addition of square of (tens digit - unit digit) then subtraction of square of (tens digit - unit digit) and so on..
For ex. 15;
15 + (5 - 1)^2 = 31

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