If a * b = 2a – b – 2, find the value of 8 * 7.
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If a * b = 2a – b – 2
Putting a = 8 and b = 7, we get
8 * 7 = 2 x 8 – 7 – 2
⇒ 8 * 7 = 16 – 7 – 2
⇒ 8 * 7 = 7
Hence, 8 * 7 = 7
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If the sum of the number 842 and two other numbers obtained by arranging the digits in cyclic order is divided by :
(i) 111
(ii) 14
(iii) 37
If a * b = a + 2b + 5, then find the value of 4 * 5.