exam Maths Puzzle Numerical Ability

Derive: K

1.M&~M
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I need help to complete the above derivation. Thanks.

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exam Other Question

The probability that an individual is left-handed is 0.11. In class of 40 students, what is the probability of findind five left-handers? How can I solve this problem using substitution

x-3y=-1
5x-7y=19