123, 124, 120, 129, 113, 138, ?
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Given : 123, 124, 120, 129, 113, 138, ?
To Find : Missing number
Solution:
123
123 + 1² = 124
124 - 2² = 120
120 + 3² = 129
129 - 4² = 113
113 + 5² = 138
138 - 6² = 102
102 is next number
Tₙ₊₁ = Tₙ + (-1)ⁿ⁺¹ * n² where T₁ = 123
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