Question

66. The sum of n ter m of n terms of two APs are in the ratio of -5 Then the term of the two series are 5n+17 equal (a) 12 (b) 6 (C) 3 (d) None the first in terms common to the series

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Solution

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Let ( A P_{1} ) be ( a_{1}, a_{1}+alpha_{1}+a_{1}+2 d_{1} ) ( A P_{2} ) be No [ 7 t-6=5 t+6 ] [ begin{array}{r} 2 t=12 t=6 end{array} ] Ans (B) ( 6^{text {th }} ) term are equal