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I think that you're doing the same thing that I did for IB. Here's what I think you're asking for : 0, 2, 6, 12, 20, 30, 42... c₁ = 0 c₂ = 2 c₃ = 6 (c₂ + 4 = 2 + 4 = 6) c₄ = 12 (c₃ + 6 = 2 + 4 + 6 = 12) c₅ = 20 (c₄ + 8 = 2 + 4 + 6 + 8 = 20) c₆ = 2 + 4 + 6 + 8 + 10 etc... dn = (n/2) <2c₁ + (n-1) 2> dn = (n/2) <2 (2) + (n-1) 2> dn = (n/2) (4 + 2n - 2) dn = (n/2) (2 + 2n) dn = (2n/2) + (2n²/2) dn = n + n²
YES
>>>hindi k dn yan alam<<<
20 with an exponent of 2 means 20 squared, or 20 times 20, or 400. An exponent of 3 means 20 cubed, or 20 times 20 times 20, or 8000. The exponents work as they do for any other base.
Simple. When a number is 'squared' it simply means it is multiplied by itself. So, '20 squared' means 20 x 20, which equals 400.