21st term of an A.P is 20 and 11th term is 30 more than its 1st term . Find the 1st term and the common difference.
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HEY MATE HERE IS YOUR ANSWER
a+ 20d = 20
a+10d = 30
by elimination method
10d = -10
d= -1
a+ 20d = 20
a+10d = 30
by elimination method
10d = -10
d= -1
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