Question

In an A.P d=-3,n=18 and an=-5. find 'a'​

Answer 1

Answer:

$a_{n} = a + (n - 1)d \\ given \: a_{n} = - 5 \\ d = - 3 \\ n = 18 \\ \\ using \: formula \: \: \\ \\ a_{n} = a +( n - 1)d \\ - 5 = a + (18 - 1)( - 3) \\ - 5 = a + ( - 42) \\ - 5 = a - 42 \\ a \\ - 5 + 42 = a \\ a = 37$

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Answer 2

Answer:

a=46

Step-by-step explanation:

nth term=a+(n-1)d

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

-5=a-51

a=46