In an A.P. 10th term is -38 & 15th term is -63. Find the first term of that A.P.
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Answer:
given a10=-38
a15=-63
a=?
a15=a10+5d
-63=-38+5d
-25=5d
d=-5
a10=a+9d
-38=a-45
a=7
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