1.

._(72)^(108)X overset(2 alpha)rarr overset(beta)rarr overset(gamma)rarr ._(Z)^(A)X'. Z and A are

Answer»

69172
172,69
180,70
182,68

Solution :`._(72)^(180)X OVERSET(2 ALPHA)rarr ._(68)^(172)P overset(beta)rarr ._(69)^(172)Q overset(gamma)rarr ._(69)^(172)X`


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