Instructions

What should come in place of the question mark (?) in the following number series ?

Question 153

7, 33, 137, 553, ?, 8873

Solution

The pattern here followed is :

7 $$\times$$ 4 + 5 = 33

33 $$\times$$ 4 + 5 = 137

137 $$\times$$ 4 + 5 = 553

553 $$\times$$ 4 + 5 = 2217

2217 $$\times$$ 4 + 5 = 8873

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