Mathematics
If a * b = a + 2b + 5, then find the value of 4 * 5.
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Answer
If a * b = a + 2b + 5
Putting a = 4 and b = 5, we get
4 * 5 = 4 + 2 x 5 + 5
⇒ 4 * 5 = 4 + 10 + 5
⇒ 4 * 5 = 19
Hence, 4 * 5 = 19
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