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کون سا عدد خالی کو بھرتا ہے: ___ + (−18) = −31؟

A49
B13
C−49
D−13
Answer & Solution
Correct answer: D. −13
18 کو −31 میں شامل کرنے سے غائب عدد −13 ملتا ہے۔
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