Question
Download Solution PDFWhat is the mean of the first five triangular numbers?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFTriangular number will satisfy following conditions,
Xn = n(n + 1) /2
⇒ X1 = 1
⇒ X2 = 3
⇒ X3 = 6
⇒ X4 = 10
⇒ X5 = 15
N∴ Mean of first five triangular number = (1 + 3 + 6 + 10 + 15) /5 = 7
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