1.

Determine m so that 2m +1, m +1, -m + 3 are inА.Р. :(a) 1(c) 3O (b) 2o (d) -2

Answer»

If these no. are A.P , then their common difference should be same

=> m+1 -(2m+1) = -m+3 -m-1 => -m = -2m +2=> m = 2

option b



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