1.

1+2+3+…….+(n+1)= ((n+1) (n+2))/(2) , n in N.

Answer»

<P>For P(1) , L.H.S = 7 = R.H.S.
For P(1) , L.H.S = 3 = R.H.S.
`P(k) rArr P(k+1) , k in N` is not true
By the principle of mathematical INDUCTION P(n) is true for all `n in N` . Which is not true .

ANSWER :B


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