As, (7,51,22)
⇒(7,72+2=51),⇒(7+15=22)
Similarly, (4,18,19)
⇒(4,42+2=18,(4+15=19) follow
(b) (11,123,26)⇒(11,112+2=123),
(11+15=26)
(c) (6,38,22)⇒(6,62+2=38),
(6+15=21≠22) Not follow
(d) (3,11,18)⇒(3,32+2=11),
(3+15=18) follow.
So, option (c) is not related the group.
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