Find a recurrence relation for the number of strictly increasing sequences of positive integers that have 1 as their first term and n as their last term, where n is a positive integer. that is, sequences a1 , a2 , ak , where a1 = 1, ak = n, and aⱼ < aⱼ ₊ ₁ for j = 1, 2, . . , k − 1.

Step-by-step explanation:

where k>1 and S(1)=1

  q

step-by-step explanation:

each line from a vertex to the midpoint of the opposite side is called a median. the point where the medians intersect, point q, is the centroid.

the centroid of δabc is point q.

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step-by-step explanati∵∵∴∴on: