book Maths Puzzle Numerical Ability

Evacute. this is a combination problem.
5C3 x 12C10/11C7

combination method is nCr and the problem above is in nCr form.

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book Other Question

i have to find the slope intercept form of the equation of the line passing throught points(-1,-2)and (-4,-3) i got the answer 1/3 now i have to plug it in and solve which formula THE PRODUCT OF A NUMBER AND SIX IS TEN LESS THAN SIXTY