Exams › SSC CGL (Prelims) › General

If + means d7 and - means f7, which is incorrect?

1. 8 - 2 + 3 = 12
2. 6 + 3 - 2 = 9
3. 4 - 2 + 5 = 15
4. 9 + 1 - 3 = 3

Correct answer: 4 - 2 + 5 = 15

Solution

After substitution, the expressions should be evaluated using d7 for + and f7 for -. The incorrect one is the expression whose substituted value does not match the given result. Here, 4 - 2 + 5 becomes 4 f7 2 d7 5 = 10, not 15.

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