which term of the AP : 3 ,15, 27 ,39 ,....will be 132 more than its 54 term
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do that for your answer
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a54=a+53d =639
add132 on them
771=a+(n-1)d
771=3+12n-12
n=65
add132 on them
771=a+(n-1)d
771=3+12n-12
n=65
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