Question

10,22,69,280,480,a
What is the letter a?

Answer 1

answer is 880.

1) 10*2+2=22

2)22*3+3=69

3)69*4+4=280

4)280+200=480

5)480+400=880

Answer 2

9 x 1 + 1 = 10

10 x 2 + 2 = 22

22 x 3 + 3 = 69

69 x 4 + 4 = 280

280 x 5 + 5 = 1405

Hence a is 1405

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