Question

in an AP the first term is -5 and last term is 45. If sum of all numbers in the AP is 120 then how many terms are there? what is the common difference?​

Answer 1

Answer:

n=6,d=10

Step-by-step explanation:

a=-5

l=45

S=120=

$\frac{n}{2} (2a + (n - 1)d) = \frac{n}{2} (a + l)$

240=n(-5+45)

n=240/40

n=6

45=-5+5d

d-1=9

d=10

Answer 2

Answer:

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