(6a + 2b + 7c)2 નો વિસ્તૃત સ્વરૂપ લખો.

1
36a2 + 4b2 + 49c2 + 28ab + 28bc + 84ac
2
36a2 + 4b2 + 49c2 + 24ab + 28bc + 84ac
3
36a2 + 4b2 + 49c2 + 24ab + 28bc + 94ac
4
36a2 + 4b2 + 49c2 + 24ab + 23bc + 84ac

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