Question

- 1 + 2 + 5 +...........+296

Answer 1

d => 3

n => ?

a => -1

s => 296

s = n/2 { 2a+(n-1) × d}

296 × 2 = 2×-1 + 3n-3

592 + 5 = 3n

597/3 = n

n = 199

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Answer 2

199

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