Answer:(c)
Step-by-step explanation:
option c represent 
According to the law of vector addition, When two vectors are added such that they are represented as two sides of a triangle in magnitude taken in the same order, then the third side represents the results of the two with order opposite of two.
In option c order of 
and 
are same and thus third side represent the resultant of two.
There is no question.
For lines are parallel, graphs : they must have same gradients as every points. Geometry: prove using alternate angles, corresponding angles or interior angles
For lines are perpendicular, graphs: their gradients multiply to give -1. Geometry: they form a right angle
Answer:
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Step-by-step explanation:
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Number of ways the second grade students can sit on the first row is 5! = 5P5
Number of ways 15 first grade students can sit in the remaining 20 seats is 20P15
Therefore, required number of ways is 5P5 * 20P15. (option B)
