Which of the following numbers will replace the question mark (?) in the given series?
1, 3, 10, 41, ?, 1237

Option
a) 202
b) 210
c) 200
d) 206

Solution

1, 3, 10, 41, ?, 1237
1\times 2 + 1 = 3, 3\times 3 + 1 = 10, 10\times 4 + 1 = 41
Apply sum logic to Next Number
41\times 5 + 1 = 205 + 1 = 206
Next Number
206\times 6 + 1 = 1237
Ans = 206

Correct Answer : 206

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