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Oksanka [162]
4 years ago
15

1. Find the sum of the first five (5) terms of the arithmetic progression60 + 91 +122 ---.​

Mathematics
2 answers:
bulgar [2K]4 years ago
8 0

Step-by-step explanation:

to find the sum of nth term

equation is

n/2 ( 2a + (n-1)d) where a is the 1st term and d is the common difference

5/2 ( 120 +( 4 × 31))

5/2 ( 120 + 124)

5/2 × 244

5 × 122 <em>dividing</em><em> </em><em>2</em><em>4</em><em>4</em><em> </em><em>by</em><em> </em><em>2</em>

610

ozzi4 years ago
7 0

Answer: 610

Step-by-step explanation:

This sequence starts at 60 and increases by increments of 31.  Thus, to get the last two numbers, do 122+31=153, and 153+31=184.  Then add 60+91+122+153+184 to get 610.

<em>Hope it helps <3</em>

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