Question

find the sumof first 19 term of the AP 2, 7, 12 ,17​

Answer 1

Answer:

893

Step-by-step explanation:

Here,

a=2 , d=5 and n=19

Using the formula,

Sn = n/2 [ 2a 3 ( n-1 ) ]

we get,

S19 = 19/2 [ 2*2+ (19-1) 5 ]

since, a = 2, d = 5 and n = 19

= 19/2 [ 4+90 ]

= 19*47

= 893

Hence, the sum of first 19 terms of the given AP is 893 .

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