Questions
If the sum of first terms of two A.P.’s are in the ratio then the ratio of 12th term is
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a
8 : 7
b
7 : 16
c
74 : 169
d
13 : 47
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Correct option is C
Let two A.P.’s bea,a+d,a+2d,…and A,A+D,A+2D,…We are givenn2[2a+(n−1)d]n2[2A+(n−1)D]=3n+87n+15⇒a+n−12dA+n−12D=3n+87n+15 Put (n−1)/2=11 or n=23.∴ a+11dA+11D=3(23)+87(23)+15=77176=716Similar Questions
If the sum of first terms of an is , then the sum of squares of these terms is
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