Question

number series of 11,20,63, 248___
find the missing value with steps​

Answer 1

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$11 \times 2 - 2 = 20 \\ \\20 \times 3 + 3 = 63 \\ \\63 \times 4 - 4 = 248 \\ \\248 \times 5 + 5 = 1245$

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Answer 2

11*2-2=20

20*3+3=63

63*4-4=248

248*5+5=1245