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- The 5thterm and the 21stterm of a series in an A.P. are 10 and 42 respectively. Find the 31st term.Option: 1</st
The 5thterm and the 21stterm of a series in an A.P. are 10 and 42 respectively. Find the 31st term.
Option: 1
62
Option: 2
__
Option: 3
__
Option: 4
__
Answers (1)
a+4=10-------(1)
a+20d=42------(2)
By substituting equation (1) from equation (2), a=2
31stterm = a+30d=2+30(B)=62.
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