Question

the sum of the first n terms of an ap p, 3p, 5p, is

Answer 1

Sn=n/2 (2a+(n-1)d)
a=p
d=2p
Sn=n/2(2p+(n-1)d)
Sn=n/2 ×2p(n)
Sn=pn×n

Answer 2

Step-by-step explanation:

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