Questions
If the ratio of sums to n terms of two A.P.’s is then the ratio of their terms is
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a
172:99
b
172 : 101
c
175 : 99
d
175 : 101
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Correct option is B
Let two A.P.'s be a,a+d,a+2d,a+3d,…and A,A+D,A+2D,A+3D,…According to the given condition, n2[2a+(n−1)d]n2[2A+(n−1)D]=5n+73n+2 ⇒ a+n−12dA+n−12D=5n+73n+2Putting n-12=16 or n=33, we get a+16dA+16D=5(33)+73(33)+2=172101Similar Questions
The sum of terms of an is The number of term which equals 159, is
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