In an AP, the 7th term is 30 and the 10th term is 21. Find the first term,
common difference and its n the term
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7th term = 30 10th term = 21
a+6d= 30
a+9d =21
change the signs
-3d = 9
d =-3
becoz a+6d = 30
so. a -18 = 30
a= 48 ..
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