Question

Which term of the A.P. : -2 , -7 , -12, …….. will be -777 ?​

Answer 1

Answer:

a= -2

d= -5

n= ?

an =-777

a+(n-1)d= -777

-2 +(n-1)(-5)= -777

(n-1)(-5)= -775

n-1 = -775/-5

n-1= 155

n=156 term

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