Question

find the sum of the first 30 multiples of23​

Answer 1

Answer:

Step-by-step explanation:

S=n/2(frst term+last term)

Frst term=23

Secnd term=30*23=690

Sum=30/2*(23+690)

=10695

Answer 2

Answer:

a=23

an or l = 690. ( an = l = last term)

n = 30

Sn= n/2(a + l)

= 30/2(690+23)

= 15(713)

= 10695

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