Mathematics

Problem

For an arithmetic progression the sum of the first 6 terms is 99 and the sum of the first 9 terms is 198. Which of the following gives the correct values of the first term

a

and the common difference

d

? a)

a=\dfrac{11}{3},\; d=\dfrac{22}{3}

a=\dfrac{22}{3},\; d=\dfrac{11}{6}

a=\dfrac{22}{3},\; d=\dfrac{11}{3}

a=7,\; d=\dfrac{11}{3}

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