Question

how 30th term of AP:10, 7, 4....is -77

Answer 1

A. P. = 10, 7, 4..

d = 7 - 10 = - 3

a = 10

An = a + ( n - 1 ) d

-77 = 10 + ( 30 - 1) ( - 3)

-77 = 10 - ( 29×3 )

-77 = 10 - 87 = - 77

L.H.S. = R. H. S.

So, 30th term of the A. P. Is - 77.

Answer 2

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