P= 2a + 2b:: 10 + 11 = 21 || 8 + 16 = 24
S= a*b :: 5 * 6 = 30 || 4 * 8 = 32
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P= 2a + 2b:: 10 + 11 = 21 || 8 + 16 = 24
S= a*b :: 5 * 6 = 30 || 4 * 8 = 32