1.

35. Find the number of terms in an A.P. 18,15,12,……., – 48 and also find the sum of allof its term

Answer»

Answer:

no. of terms = 34

sum of terms = -1071

Step-by-step EXPLANATION:

a) -48 = 18 + (n-1) -3

-48 -18 = (n-1) -3

-66/-3 = n-1

n = 34

b) Sn = 34/2 [ 2×18 + (34-1)-3]

= 17 [ 36 + -99]

= 17(-63)

= -1701



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