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tmua.me Medium Set E Paper 1 · Q5

Paper 1Sequences & series

A sequence has nnth term

un=an2+bn+c(n=1,2,3,…),u_n=an^2+bn+c\qquad(n=1,2,3,\ldots),

where aa, bb and cc are real constants.

It is given that

u4−u1=15andu7−u4=33.u_4-u_1=15\qquad\text{and}\qquad u_7-u_4=33.

What is u10−u7u_{10}-u_7?

A1818
B3333
C5151
D6666
E6969

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