Let y=12+13+12+13+....
What is the value of y?
Explanation:
y = 12+13+12+13+....
y = 12+13+y
y = 3+y2y+7
∴ 2y2 + 7y = 3 + y
∴ 2y2 + 6y – 3 = 0
∴ y = -6±36-4(-3)(2)4 = ±15-32
As all the terms in y are positive, y is positive.
∴ y = 15-32
Hence, option (d).
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