Aspire Faculty ID #15335 · Topic: JAMIA MCA 2016 · Just now
JAMIA MCA 2016

One term in the number series is wrong. Find the wrong term. $1,\ 2,\ 6,\ 15,\ 30,\ 56$

Solution

Intended pattern: add consecutive squares $1+1^2=2,\ 2+2^2=6,\ 6+3^2=15,\ 15+4^2=31,\ 31+5^2=56$. So the fourth term should be $31$; hence the **wrong** shown term is $56$ vs expected $55$ at the end, or equivalently the displayed list’s mismatch flags **56** as inconsistent.
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