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tmua.me Medium Set F Paper 1 · Q3

Paper 1Sequences & series

The first nine terms u1,u2,…,u9u_1,u_2,\ldots,u_9 of an arithmetic progression are all positive. It is given that

u2u8=40andu4u6=48.u_2u_8=40\qquad\text{and}\qquad u_4u_6=48.

What is u1+u2+⋯+u9u_1+u_2+\cdots+u_9?

A77
B4949
C36336\sqrt3
D6363
E126126

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