Question
Which of the following numbers is divisible by
11?Solution
8463729: Difference = (8 + 6 + 7 + 9) – (4 + 3 + 2) = 30 – 9 = 21
6938254: Difference = (6 + 3 + 2 + 4) – (9 + 8 + 5) = 15 – 22 = 7
2471865: Difference = (2 + 7 + 8 + 5) – (4 + 1 + 6) = 22 – 11 = 11
3527164: Difference = (3 + 2 + 1 + 4) – (5 + 7 + 6) = 10 – 18 = 8
2471865 is divisible by 11.
If cos1.5B = sin(B + 5°), then find the measure of 'B'.
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8 cos 40° cosec 50° − 2 cot 30° cot 60°Â
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