Question

In an A.P., if a=1,tn=20 and an=462 then n is ___

Answer 1

Step-by-step explanation:

20-1 =(n-1) d

( n-1) d= 19824

Sn=n/2[2 a+(n-1) d]

462 = n/2 [2(1) +19] {( n-1) d= 19

462 ×2 = n [2 + 19 ]

924=n[21]

n=924/21

n= 44 is tha answer.

Answer 2

Answer:

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