The pattern is +12,+24,+36,+48, . . . .
So,missing term=78+48=126
The terms of the given series are 3*(1*1),3*(2*2),3*(3*3),3*(4*4), . . . .
So,missing term is 3*(6*6)=108
The first letter moves 1, 2, 3, ... steps forward.
The second letter moves 2, 3, 4, ... steps forward
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