Answered Oct 10, 2019
A=2
এখানে, A এর যেকোনো মান ব্যবহার করলেও A+D = ৮ হয়।
A+B=4, B+C=8, C+D=12, D+A=8
A + B = 4 ------------(1) B + C = 8 ------------(2) C + D = 12 ---------(3) (2) নং - (1) নং B + C - A - B = 8 -4 বা, C - A = 4 --------(4) (3) নং - (4) নং C + D - C + A = 12 - 4 D + A = 8 ans
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