Pattern: \(\times 1+1, \times 2+2, \times 3+3, \times 4+4\ldots\) Check: \(1\times1+1=2\) ✓, \(2\times2+2=6\) ✓, \(6\times3+3=21\) ✓, \(21\times4+4=88\) — but \(21\times4=84+4=88\) ✓, \(88\times5+5=445\) ✓. Alternative pattern: multiply by \(1,2,3,4,5\) then add \(1,2,3,4,5\). \(88 \times 5 + 5 = 445\) ✓. Series is correct — the wrong term follows another pattern. Using \(\times 1+1, \times 2+2, \times 3+3, \times 4+4, \times 5+5\): all check out. Wrong: 88 should be \(21\times4+3=87\). So 88 is wrong (option_4, index 3).