Arithmetic progression 21 42 63 84 ............... 420?
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Answered by
3
Answer:20th term
Step-by-step explanation:
a=21
d=21
=420
n=?
=a+(n-1)d
420=21+(n-1)21
(n-1)*21=399
n-1=399/21
n-1=19
n=19+1=20
ans..therefore the 20th term of the AP is 420.
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Answered by
0
d=42-21=21
d=63-42=21
it's an AP
An=420
a=21
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