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If the 3rd and the 9th terms of an AP are 4 and -8 respectively, which term of this AP is zero

Posted by Kumkum Kumari 6 years, 1 month ago

CBSE > Class 10 > Mathematics

2 answers

Abhay Joshi 6 years, 1 month ago

Given, a3 =4 and a9 = -8 a3 = a+2d = 4--------equation 1 a9 = a+8d = -8--------equation 2 Subtracting equation 1 and 2 We get, d = -2-------------equation 3 Putting equation 3 in equation 1 a+2d = 4 a+2(-2) =4 a+4 =4 a= 4+4 a=8 Now, a1 =8 a2 =a+d =8+(-2) = 6 a3 =a+2d=8+2 (-2) =4 a4 =a+3d=8+3 (-2) =2 a5 =a+4d=8+4 (-2) =0 Hence the 5th term of an AP is 0

1Thank You

Radiation ッYt 6 years, 1 month ago

5 th term is zero

0Thank You

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