The correct option is D 187 7,11,23,51,103,? 7+4× 1= 11 #160; 11+4× 3=23 ← difference of 2 23+4× 7=51 ← difference of 4 5 ...

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Sequence

7, 11, 23, 51...

Question

7, 11, 23, 51, 103 ?

186

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188

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185

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187

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Solution

The correct option is D 187
$7, 11, 23, 51, 103, ?$
$7 + 4 \times 1 = 11$
$11 + 4 \times 3 = 23$ $\leftarrow$ difference of 2
$23 + 4 \times 7 = 51$ $\leftarrow$ difference of 4
$51 + 4 \times 13 = 103$ $\leftarrow$ difference of 6
$103 + 4 \times 21 = 187$ $\leftarrow$ difference will be of 8

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