Question
What will come in place of the question mark (?) in the
following series? 2, 5, 16, 47, 138, ?Solution
ATQ,
2 × 2 + 1 = 5
5 × 3 + 1 = 16
16 × 3 - 1 = 47
47 × 3 + 1 = 138
138 × 3 - 1 = 413
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If  a 2 + b 2 + c 2 = 40 & ab + bc + ca = 12 then a + b+ c = ?
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