Math, asked by arnavmore, 6 months ago

If the 9th term of an A.P. is 16, then find the sum of the first 17 terms of this A.P.

Answers

Answered by anubhavdamri7887

0

Answer:

272

Step-by-step explanation:

ATQ

A9 = 16

A + 8D = 16 ----------- 1st equation

S17 = 17/2 [2a + (n-1)d]

S17 = 17/2 [ 2a + ( 17 - 1) d]

S17 = 17/2 [ 2a +16d]

= 17/2 [ 2(a +8d)]

= 17/2 [ 2 × 16 ] ---------- from 1st equation

= 17/2 ( 32 )

= 272

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