Question

Find first term of an A.P. whose common difference is -3 and 18th term is -5.

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Answer 1

Answer:46

given, d= -3,a18=-5

an=a+(n-1)d

or, -5=a +(18-1)-3

or,-5=a+17×-3

or,-5=a-51

or,a= 51-5

or, a=46