Solution
The pattern followed is that twice the first number is added to the second number.
Eg : 3 * 4 = $$2\times3+4=6+4=10$$
and 5 * 8 = $$2\times5+8=10+8=18$$
Similarly, 7 * 7 = $$2\times7+7=14+7=21$$
=> Ans - (B)
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