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Numbers - General Aptitude

Q1:

9 + 3 + 7 + 2 - 9 + 1 = ?
4 17 15

A
7 + 719
1020

B
9 + 817
1020

C
9 + 719
1020

D
7 + 817
1020

E None of these

ANS:D -

7 + 817
1020

Given sum
= 9 + 3 + 7 + 2 - 9 + 1
4 17 15
 
= (9 + 7 - 9) + 3 + 2 - 1
4 17 15
 
= 7 + 765 + 120 - 68
1020
 
= 7 + 817
1020