What should come in place of question mark (?) in the following questions ?
$$\sqrt{3969}+\sqrt{7921}$$
Expression : $$\sqrt{3969}+\sqrt{7921}$$
= $$\sqrt{49 \times 81} + \sqrt{7921}$$
= $$(7 \times 9) + 89$$
= $$63 + 89 = 152$$
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