Question

If the common difference of an A.P. is -3 and the 18th term is -5, then find its first term.​

Answer 1

Answer:

a=46

Step-by-step explanation:

Given-d=3

a18=-5

a18= a+(n-1)d

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

-5=a+17×(-3)

-5=a-51

-5=a-51

-5+51=a

a=46

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