In An ap the 11th term is 38 And 16th term is 73 find the 31st term
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Answer:
a11 = 38
a + 10d = 38 ----> 1
a16 = 73
a + 15d = 73 ---> 2
Solving 1 & 2
a + 10d = 38
a + 15d = 73
- - -
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- 5d = - 35
d = 35/5
d = 7
Substitute the value of d = 7 in equation 1
a + 10d = 38
a + 10(7) = 38
a + 70 = 38
a = 38 - 70
a = -32
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