Question

the nth term of an A.P. is 18. Its first term and common difference are 50 and -4 respectively . find the sum of first n term of the A.p.​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

a =50 ,d= -4 , n= 8

since,Sn = n/2{2a+ (n-1)d}

so,S18=18/2{2(50)+(18-1)-4

=9{100+(17) -4}

=9{100+(-68)}

=9{32}

=288

so,Sn=288