The 3rd and 7th term of an arithmetic progression are -9 and

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M: +2.00/-0.67

The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?

[2017 SSC CGL 21 AUG S-3]

A 28

B 87,

C 51,

D 17,