Most of the students face difficulty while solving missing number problems in competitive exams. These Missing Number questions asked often in SSC and the competitive exams.

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@ekta: 10-4=6 8-6=2 6+2=8

            15-14=1  18-11=7    1+7=8

5+6+9=20
4+8+3=15
9+7+9=25
7+8+7=22

Please explain question number 9

Please explain the Ques no 9

Please explain question no 21

Question no 20, i don't understand, plz explain