by facrarizing (×+1) (×+2)(×-14)(×-15)+28 so we get
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Answer:
The series followed in the upper line is
15, 159-15=144, 259-159=100, 323-259=64
That is the difference is the square of alternate numbers
Therefore, in the series below
7, 144+7=151=P,151+100=251=Q, 251+64=315=R
Answer is Option B
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