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6, 7, 4, -7, -34, ?

 A) 63 B) -93 C) -83 D) -53

 B) -93

Multiply each number by 2 and subtract 5, 10, 15, 20,......

$$\Large 6 \times 2-5=7$$

$$\Large 7 \times 2-10=4$$

$$\Large 4 \times 2-15= -7$$

$$\Large -7 \times 2-20= -34$$

$$\Large -34 \times 2-25= -93$$

Part of solved Number series questions and answers : >> Aptitude >> Number series